How do you add link in the signature?
Like when you want to direct it to your site or something.

In square brakets, put "url=http://websiteURL" then outside of that put in the text you want, then end it with "/url" or just "url" in square brackets once more. So something like (url=http://mangaupdates.com/)Manga Reviews Here(/url).

https is for if the website is secure, but you shouldn't be linking anything outside of this website... I think?

Should work like so:
Manga Reviews Here

I'm a jack of all trades but master of none. Too many jars and not enough hands.

Sorry, not working

Try this: https://www.bbcode.org/creating-links-with-bbcode.php

Odd, it's working for me. I'll leave it in my signature for a few days so you can check on it.
Maybe it's just your browser?

I'm a jack of all trades but master of none. Too many jars and not enough hands.