All members can add or remove the contacts in their forum membership account. Here is a pictorial explanation on how to use the Friends and Ignore lists. Friends List Features:
Send Friendship requests
Find their current online status
Private Message them instantly
Go to User CP and click Contact and Friends link under Networking column.
Scroll down, enter username of member whom you wish to be friend and click "Add Contact" button.
This action also sends them a friendship request. Untick the checkbox and save the settings to remove someone.
Alternatively you can also access the friends list by opening contacts pop up menu under quick list on navigation bar. Ignore List Features:
Hide all posts by an annoying member
Prevent the member from messaging you
Ignore member without letting them know
Go to User CP and click on "Edit Ignore List" link under settings and options column.
Add the username of member(s) to whom you wish to ignore and click "Okay" button.
To remove someone from ignore lists, untick on their username and click Save Changes.