I actually am enjoying the struggle hahahahaha I'm sorry
Ok, real info; Copy the link from the address bar on your browser, like normal. Then go into Edit Signature, and press the little button next to the font and color that looks like an Earth. Paste the link in when prompted, bam-o. Done.
Doing it that way, unlike just pasting the link into the signature box... will give you the option to write something for the link to say. For example, my signature link says "[How to make Butane Honey Hash Oil]" instead of something like "https://www.rollitup.org/toke-n-talk/413954-how-butane-honey-hash-oil.html"