Through Connections
Go to Connections in the menu.
Click on the Friends category to see a list of all your friends.
Scroll through the list or use the search bar to find the person by name or username.
Once you’ve found the person, click on the three dots next to their name and select "Unfriend".
From the User's Profile
Visit the profile of the person you want to unfriend.
In their profile info card, click the Friends button and then select Unfriend in the popup.
The user will not be notified when you unfriend them. If you change your mind, you can send a new friend request at any time, but the user will need to accept it.