Login to your account from Namecheap.com . And see the screenshot below.
NameCheap Dashboard

Click on the “SSL Certificates” button from the “ Dashboard” . And you can see the page like the screenshot given below.
NameCheap SSL Certificates

Now go to the domain from which you want to get the "SSL Certificate" .
Now you will see many “SSL Installed Certificates” like the screenshot given below next to your domain.

Here you "cPanel" and "SSL Certificate" you can see.
From here, click on the “Reissue” button in the dropdown menu .
SSL CSR Generatin Sections.

Notice here. Because, all the steps here are very important. Clicking on the “Reissue” button will take you to a new page and display the page as shown in the screenshot above.
You need to open a new tab by clicking on “What is CSR and how to create one” button.
Now look at the image below:
Now you have to go to this link and click on Generate CSR: https://decoder.link/csr_generator link from “CSR Generation Notes” .
CSR Generator Page
Now a page like the image above will appear. You have to give all the info here as I have shown in the image above.
Fill in all the info correctly and click on “Generate” button.
Now you will get 3 types of code in 3 tabs like the image mentioned above.
“CSR, Private KEY, And Certificate” These 3 codes will be given different names, for example, you will save the files in “.Txt” format with the exact same name given in 3 tabs .

Save all the codes and “I have copied the private KEY. Click on “Close this windows” button.
Now copy the "CSR" code that you got from here. And follow the screenshot below
SSL Info Page
Paste your copied “CSR” code into the “Enter CSR” box and click the “Next” button.

Now you don't have to do anything, just click on the "Next" button and go to the next step. Here “DCV Method” will be auto selected. If you do not understand, see the image above.
Now do all the info "Review" If everything is OK, click on the "Submit" button and go to the next step.
SSL Details Page
Now do the work carefully. Click the "Get a CNAME" button. However, you must open a new tab.
Clicking on the "Get a CNAME" button will take you to the page like the image above. There is a button called "EDIT METHOD" on the right side . From the drop-down menu when you click "Get Record" the name of a button, and find the "Get Record" button.

See image above. Here “Domains to validates” shows your domain and below are two codes “Host” and “Target” . Copy these two codes first and put them on the note pad and follow the steps below.
Now click on the “Manage” button next to the domain for which you have created “SSL Certificate” for “Dashboard” . If you do not understand, see the image below.
"Manage" from the "Domain Details Page" will take "Domain Details Page" from the "Advance DNS" page moved. If you do not understand, see the image below.

Now click on “Add New Record” button and add “CNAME” record.
CNAME Record Page

Now put the two codes that you got "Host" code and "Target" code in two boxes. "Host" box "Host" of the code and put the "Target" box "Target" of the code by putting " " Check the save button.
Now come to “SSL Details Page” and “Reload” the page. And you will see the update page like below.

Now download your “SSL Certificate” by clicking on the “Download Certificate” button on the right side .

Now click on “Apps” button from “Dashboard” . Then you can see the "EasyWP" app. Now click on “EasyWP” app. And follow the steps below.
Click on “Manage”
Click on “Custom PositiveSSL” and “Extract” the files that you have downloaded from the “SSL Details Page” and keep the 3 more files that were there before. You will get a total of six files. You will get 3 files in the zip file and the other three are made with "CSR Generator" .
Custom SSL Certificate Installation
Now upload three types of files in 3 boxes. The file will be in the "CSR Generator" with the "Generate" to "Private KEY", "Certificate" .crt file and the ".ca bundil" file. Now upload three files in three boxes. Follow the image below.
Upload “Private KEY” in the first box .
Upload “SSL Certificate” in the 2nd box .
And upload “CA Bundle” in the 3rd box and click “Change” button.
You have successfully installed “SSL Certificate” . Now let's verify that "SSL Certificate Valid" .
Click here and enter the address of your web site. If you do not understand, see the image below.
Your web site is 100% secure. You have successfully installed "SSL Certificate" .