How do I make a signature display?

[mm2rider]

How do I make a signature display? I tried putting the image url on the Signature thing but it's not showing.

[Triple_X]

you have to copy the image function shortcuts

so it is

n-joy
Triple X

[Franch88]

Besides do what Triple_X says (already explained in an old topic present in this forum section, that's only in case you want to use images), you have to go in your Profile settings and set Yes to the option Always attach my signature, then Submit. I'll enable the signaure to the posts that you've already posted.
If you plan to use an image for your signature, as seems, please make it pretty little, in way to don't enlarge the posts default space and to don't disturb the posts reading.

[mm2rider]

What size should the picture be?

[Franch88]

What size should the picture be?

Well, not too much big to don't resize the width of the posts and to don't cover most of the post space in height. For example, the Triple_X's one visible in his post above has perfect sizes, make one like it.