to get the links added all you need to do is find a link that you want and copy it to your sig. the color thing i really don't know but i believe that "cate" posted a thread about the color changing the color to your lettering
and welcome to cb
when i go to edit my signature...there is no option that i see aside from typing in text. where the stuff for links & different color text, etc...?
Use the "Go Advanced" button in a post, you can test out any of the formatting controls. When you are happy with the result, copy and paste it into a sig form.