How to block someone

Go to the member's house and click here (at the top of the house-page):




The button 'Block this member' will be changed into the button 'You are blocking this member':

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How to unblock someone

Click 'Blocked List' (or 'You are blocking this member' on the members house) and you will see whom you have blocked.
Before each name you'll see a button that says 'Remove blocking'.