To remove or delete a friend from your profile, click on the icon with two people in the top right corner.
A window will open with a list of your friends. You can either scroll down to find the person or use the search field to look them up.
Once you've found the person, click on the three black dots next to their name.
Select "Remove friend."
Confirm the action when a new window appears.
Note: If the person follows one of your wish lists, they will still have access to that list. To remove them as a follower of a wish list:
Go to the wish list they are following.
Click on the blue text showing the number of followers on the list.
Find the person, click on the three black dots next to their name, and select "Remove follower."