This tutorial assumes you've already logged in to phpBB
Now let's learn how to ban users from accessing and using the forums
1) Click Users and Groups
2) Click Ban usernames
3) Enter the username you wish to ban here
4) You can select the period of time for the ban to last... from 1 hour to permanent
5) Click Submit
That's it! The user has been banned from using the forums
You can ban additional users from this page if you wish
This is the end of the tutorial. You now know how to ban users in phpBB