to insert a link? I'm not REALLY good at it (I've seen other people rename the link and make it fancy) but what I know can work is:
1) go to edit signature
2) go to another window and open the page that your kids' message board is on
3) copy the exact message board address MINUS the http:// part. So just start at the www. blah blah blah...
4) in your signature window: hit the little square that has what looks to be an earth with a paper clip under it. Next to that graphic is the paperclip with a red "x" through it. It's under the white smiley face graphic and near the font and size stuff. It's called "INSERT LINK"
5) click on the insert link and paste your www info from your kids' message board. then click ok. EXTRA BIT: Before you click anything else..while the www. blah blah blah is highlighed you can go to the change color bit and change the color to blue which is the globally accepted color for a link. LOL
Now that's an advanced move for me as if I forget to change the color while I am still highlighed then I can NEVER change the color because for the life of me I can't understand how to do html or whatever and I can't go back and change the color after it's already inserted. Go figure.
Alrighty then! Good luck!