If you wish to block a player in chat so they can't communicate with you, you have three options:

Find a message from the player in the chat, right-click on their name at the beginning of the message, and then click "Block Player."
OR

Locate the player in the list of players in the upper right corner. Wait for their player card to appear, then click on the icon shaped like a red circle with a line through it at the bottom right of their card.
OR

Type the command "/block PLAYERNAME" in the chat and press enter. Make sure to correctly spell the player's name (e.g., "/block Player123").

To unblock a player you've previously blocked, simply type the command "/unblock PLAYERNAME" in the chat.

Additionally, you can use the following commands:

"/blockedplayers" to display the list of players you've blocked.

"/unblock all" to unblock all players you've previously blocked.

On mobile, to block a player, you can either click on their name in the list of players or in the chat, and then select the "Ignore" option. Additionally, the above-mentioned commands also work.

You have the option to block up to 700 players depending on your Membership. This allows you to effectively manage your online gaming experience by limiting unwanted interactions.