Hi Slotplayer,
Welcome to the forum. This is from the rules section:
http://www.casinomeister.com/forums/forum_rules.php
5. Signature Rules
5.1 - For initial registrations (Registered members) signatures are allowed - no URLs and only one line of text are allowed.
Fully Registered - Two lines of text - URLs allowed and small images
Senior Member - Four lines of text - URLs allowed and images
Meister Member - Five lines of text - URLs and big fat juicy images
5.2 - Content restrictions You may have a link to your own website or services, but there must be no promotional language like "Best Casino" or "Fastest Payouts". Affiliate links are NOT permitted.
++++++++++++++++++++++++
Since you just signed up, your rep points are at 10. When you become involved with the forum, making posts - especially helpful posts that people actually "thank" you for, your rep points increase. When you become "Fully Registered", you'll be able to include a URL. Hope this helps.