How can I leave a comment or post on someone's wall?

fanpop got rid of meebo long time ago
it's not that hard to figure it out
just go to whoever you want to write on their wall
add a smiley and a prop if you want
then click post

If you are having trouble writing on someones wall it could be:
1. That person has their account set up so that only people he/she is a fan of can write. Try sending them a message letting them know that you are trying to write on their wall.
2. The browser you are using may not allow you to write on the wall. I found that IE does not allow you, try using FF instead. That is what I use for fanpop anyway.