When the player tries to login, they will be displayed a message which tells them they are banned and also tells them how long is left until the ban expires. Attempting to bypass the ban in any way will lead to further restrictions.
We have a 0 tolerance policy against cheating in any form. This is also why the second anti-cheat ban is permanent and will not be removed. More information can be found in our anti-cheat policy on our forum.
F means, they want to remain notified for further posts in a particular thread or they want to follow the discussion by members on a particular topic. Some members type F or f or follow or following to be kept in the loop for the discussion.