Thread:Sannse/@comment-173.26.91.238-20140104032701/@comment-1330470-20140112030630

Normally when a user is blocked, the "Prevent this user from posting on their own Message Wall while blocked" characteristic of the block is not enabled, so the user can theoretically edit their own message wall. However, this doesn't seem to be the case, as this blog post indicates it's broken and bugged and you can not edit your own Message Wall. (Wikis with talk pages correctly allow blocked users to edit their own talk pages.)

Your only option, then, might be to use their wall here on Community Central. You are free to do that.