HOW DO I MUTE / IGNORE PLAYERS?
If you're wanting to remove spam, or an individual from public chat, follow this example.
In this example, the user Vladi is shouting "S> CRUISER SET + 8, 4/4 +28% ATK. SAY ME!" every 10 seconds. You're getting annoyed, so you decide to mute his shout.
Go to your public chat bar, and type /ignore Vladi
So the format of the command is: /ignore TheirCharacterName
They will now be excluded from your public chat and their dialogue bubble will no longer be seen.
HOW DO I BLOCK PLAYERS?
To block a player from messaging you privately, use the command /block along with the individuals name. Alternatively, if you are friends with them - navigate to your friends list (E Key) and right click their name. A drop down will popup, select 'Block'. Their name will now appear in red instead of the standard black. They will now be unable to message you. To unblock them, right click their name and select 'Unblock'.