Welcome to WGT Richard.
Premma, go to a friends profile you want to add to your friends list, and look at the top right of the page. You'll see the "Add as friend" button. Simply click the button and your friend request will be sent to the member you want to add as a friend.
To receive a friend request, look for the blue button to flash just below the "Play now" game client. Simply click "Accept" or "Decline" friend.
A green flashing button in the "invites" (below the game client) signifies one of your friends or a random member (depending on your status) is inviting you to a match or stroke play round.
I hope this was helpful. : )