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My forum needs an announcement that the Wiki is down because, well, the Wiki is down. How do I post the announcement in PunBB?

In my forum, I've gotten a pretty high google search ranking, and I'm being bombarded by spambots to the tune of 20+ per day. All of them use gmail.com accounts (so I can't block the email domain), but they do follow a ridiculous naming scheme: each chooses a username that goes ma***zda where the * represents a number. (1) Can I prune usernames using wildcards like this? (2) Does Punbb have a sign up mode like phpBB that requires me to manually add users who request a login? I couldn't find this option in the admin panel.

I'm receiving about five spambots a day who are quite intent on showing us CSS geeks Lindsay Lohan's nipples. They all come from just a handful of domains, which I'd like to block from registration. Short of manually editing the PHP, how can I do this? Is there an admin tool geared towards blacklisting?

When deleting a spammer's post, I get an error that the site's directory is improperly set. So I went to my Admin options, and tried to change the Base URL, but I'm receiving the following error when trying to save my changes:

Besides clearing my cache/ folder, what do I need to do to fix this problem? I don't have SSH access, so I'm not sure how to fix the problem.

I've tracked down the variables that profile.php checks for max. height and width for avatars, but I don't know where they're located:

$pun_config['o_avatars_width']

Where is this? I'd like to increase the max. size to 90x90 or 100x100px.

Edit: I know that I could just change these to numbers and have my problem solved, but I'd rather find this central configuration, because that's a much better way of doing things.$pun_config['o_avatars_width']