I've been a member for over 4 years and I still haven't figured out how to add artwork to my forum posts or to my profile, all I get is a picture icon. How do I get it to show the full thing?

You need to use image tags.

and you put the URL of the image inbetween the imgs.

If you are trying to use the image that is broken in your signature, you need to use the direct image link, not the page link. It would be this one

Use the sCode for. c: It's [img]URL[/img] without the stars.

Ohhhh...okay lol that's what I was doing wrong, it wasn't the direct link xDD thanks!