You can, if you so wish, go back over your old posts and edit them, adding a tick to the "Attach signature" box at the bottom.
http://www.wrongplanet.net/forumssearch-search_author-Shellfish.htmlYou have a few days before your earliest one goes over the 9999 minutes (almost a week) deadline for edits.
There is a down side to doing the above... in that they will all then show a message to say that they have been edited. It may not be worth the while of not only ticking the box, but also adding a comment such as:
Code:
[size=8]I edited this just to make my signature show... the post above this has not been touched.[/size]
i need to remember to use those nifty code tags so that i don't have to drop brackets and such.