Comodo is a very well known SSL provider nowadays, offering both company name display services in the same address bar as the site and, of course, it costs nothing.
Comodo’s SSL is free, but they offer three months of free trial when deciding whether to buy or not. You can sign up for a trial here https://ssl.comodo.com/free-ssl-certificate.php
This article will guide you on VestaCP, after selecting the register a table will appear, we will need CSR of the domain. Select the control panel you are using, otherwise select Other. We need to get into the VPS to get the domain’s CSR.
Go to the Vesta select the WEB section then select Edit domain name to add SSL
Scroll down the box to SSL and then click on Genarate CSR
A new tab will open, you can edit the information if necessary and then select OK to get the code
I get 3 code, copy CSR section to register for SSL on Comodo. Please keep this tab closed because we need to copy the code.
After filling out the information on the SSL registration page at the first step, you will receive a mail in your mail. Follow the instructions to enable your SSL.
Then you get 1 more mail with a zip file attached to download it. Uncompressed will have 3-4 crt files.
We will open the file tenmien_com.crt received when buying SSL copy to the SSL Certificate, return to the CSR above the code for the SSL Key copy the SSL Key section here. At the bottom we copy the code in bundle.crt file, then drag down select Save.
Wait a few minutes then check the domain name. If the image below is successful. Note, displaying the company name as a paid service of Comodo. If you set free only green security only, if not green, then most likely your database is still http link, see how to change http to https here.