AutoSSL certificate installed
from Cpanel you can now change your site over to a secure https link.
To check it click on your site link and change the http to https so if your site is domain.com just put in https://domain.com and you should see the secure connection lock icon in your browsers address bar. Then go through it to make sure all your links are working like they should.
Then you add a redirect using .htaccess, this how you do that.
Open notepad (not wordpad it has to be plain text) and paste this:
RewriteCond %{HTTPS} off
RewriteRule (.*) https://%{SERVER_NAME}/$1 [R=301,L]
SAVE AS: .htaccess
On your computer it'll say .htaccess.txt - notepad needs that .txt extension
FTP that to your ROOT DIRECTORY, that is where all your website files and folders are.
Once there use the FTP client to rename it to just be .htaccess
A NOTE:
As a configuration file, .htaccess is very powerful. Even the slightest syntax error (like a missing space) can result in your content not displaying correctly or at all.
ALSO
Since .htaccess is a hidden system file, please make sure your FTP client is configured to show hidden files. This is usually an option in the program's preferences/options.
Now you need to update your sitemap.xml <url> <loc> to https and delete the old or just edit it online with your ftp client plus if you use a schema on your pages update those.
Once that's all done in Google webmaster you actually need to add a new property to search console by clicking on the "add a property" button and adding the full url. https://www.domain.com and https://domain.com
Google advises you add all four properties: https://www.domain.com https://domain.com http://domain.com and http://www.domain.com
Then you can set the prefered domain.
Google Analytics has a simple way of updating the site with a drop-down box that contains http & https.
There can be more to it, but that's it simplified.
You can always do a search on it for more info.