Finaly I got it to work. I have chosen a color to use. How do you remove the code for the color to use. It shows up in my posts:
example [color=blue] (how to remove those words)?

I'm afraid the colour option has been turned off for signatures, as has the bold, italic etc... tags. These only work in the posts, the signatures only allow plain text. Sorry.

However to get the colour to work in your posts, you have to use a "end tag". Like below, but without the "

e.g. ["color=blue"] (type your text here) ["/color"]

Hope it helps