Bukkit

1. Create a sign with colors and custom text
2. Type /tnttag setup createsign <ArenaName>
3. Join the arena so that the sign updates
4. Enjoy

For Advanced Users

1. Create a sign with colors and custom text
2. Type /tnttag setup createsign <ArenaName>
3. Stop the server
4. Edit signs.yml
5. Find your sign
6. Add variables like {max_plaers], {min_players], and {players}
7. Save it
8. Start the server
9. Join the arena so that the sign updates
10. Enjoy