Cannot enable SSL

[GeekyFuroshiki]

I've set up my shop (www.geekyfuroshiki.com), and have noticed that the address bar has no https and marks it as not secure. I've gone into the OVH dashboard to make sure my SSL certificate is set up, and find there is one domain that doesn't have it, but whenever I go edit and try to enable the SSL on it, I get a 

An error has occurred when modifying the domain/s of your hosting plan.

message.

What am I doing wrong here?

Edited June 19, 2020 by GeekyFuroshiki (see edit history)

[Rhobur]

Since apparently you already have a SSL cert active for the domain, did you try enable SSL in PS admin (Preferences->General), https://i.imgur.com/LgIXIfZ.png?

[GeekyFuroshiki]

I renewed the cert and found the Preferences, so have enabled SLL in admin and the majority of the site is locked now, thanks, but the homepage still says insecure, which I think looking at the console is because of the jpegs I incorporated into my text block. Is there any way of fixing this, or will all text blocks with images in them be a vulnerability?

[Rhobur]

If you added those links using a custom text editor them it is easy, go there and change the http:// with https:// for the path of every picture.

[GeekyFuroshiki]

derp, of course! Thanks, are there any sites that have good advice or courses on how to use text editors like this, for embedding pics and videos and making it all look good? I'm just using the basic text editing as part of the text block module, are there any prestashop addons that improve the rich text editor?

Edited June 22, 2020 by GeekyFuroshiki (see edit history)

[Rhobur]

There are but I advise you start with reading the Prestashop user docs at http://doc.prestashop.com/