My website is going to " not secure connection… "

I checked last time and I just checked again, and your website is currently using a GoGetSSL certificate. There are no traces of any self signed certificate anymore. If you do see it, then it’s probably caused by certificate cache on your end, which you can circumvent by checking your website in Incognito Mode.

You shouldn’t ever have to touch the private key or certificate yourself. The automatic SSL installation can handle the installation for you. Rest assured it has been used successfully many times by many people, so no need to second guess it or check it yourself unless you see any issues that could be caused by it.

WordPress is already forcing everyone to HTTPS, which means you don’t need to do anything else if you don’t want to. But you could also setup a forced HTTPS redirect in your .htaccess file, which can help a little bit for performance and server load.