How to unfriend a member
Don't worry, members will not be notified when they are removed from your friends list!
Web
Hover over 'Social' on the left menu and click 'Friends'
Locate the friend you'd like to remove, then click the 'Remove Friend' icon (a person with an 'x') to the right of their username
Click 'Yes' in the text box that appears - This will remove the member from your friends list!
Mobile
Tap 'More' in the bottom toolbar and select 'Friends'
Tap on the three dots to the right of the friend you wish to remove and choose 'Remove Friend'
Alternatively, you can remove a friend from within a game by tapping on their avatar and selecting 'Remove Friend'