I think you're denied the ability to link anything in your first forum post after you register, maybe as a guard block against spammers. After that, it works okay. Feel free to edit your post and add a link plus a tantalizing graphic sample!
You can add your comic URL to your posts via the Profile
link at the top of the page, if you select Edit Profile and supply your comic URL, a little clickable www
button will appear at the bottom of your posts.
If you want a signature link and/or graphic to appear in your posts, you'll have to PM our admin Wendy Wood
and request this.