Right now, you have to manually create the anchors and the index table at the top. I'm sure this can be automated somewhat, but haven't dug that far into TWiki yet.
BTW I turned you sig into a link. If you want to have brackets around your name, just leave a space on either side like this: [ CrConrad ] That way it'll still have the brackets, but it will also automatically create the link. Or just leave out the brackets altogether and let the system make the link for you. Oh, and if you're posting anywhere but in the Main web, make sure you prefix it: Main.CrConrad