Hi Blitz,
The easiest way to search for players is by using the WGT PLAYERS section at the top of the page. This brings you to a searchable list of all the players in the game. You can narrow searches down by Tier, Country and even State to find other local players.
To get to their profile, simply click on someone's name. When their profile loads look in the top right hand corner (above their status/career earnings etc) and you'll see button that says "ADD AS FRIEND". When you click that a friend request will be sent to the other player and you'll be notified if they accept.
Hope that helps. =)