Issue Installing SSL

Dear All,

I have been trying to solve this ssl issue by following the method in this video https://www.youtube.com/watch?v=uim9FxUJSsU

I first generate  certificate from SSL GENERATOR and then Visit SSL CERTIFICATES to install the certificate but I get the error

 "Invalid certificate/key pair on server."

Don't Know what am doing wrong Its been 15 days and am still stuck on this, Anyone please help

https://yourserverip:2087/admin/index.php?module=ssl_certificate

Click AutoSSL [FREE] tab and install your ssl.

wheres the bullten ICON