The organizer for a competitive PUG can choose, from those that sign up, the players that they want to play with. This helps the organizer to select the players that they think will provide the most competitive matchup. Player Profiles can also help the organizer to make a decision on compatibility.  So it is important to make sure that your Profile including any league information is complete. 

Everyone that signs up for a competitive PUG automatically goes on the WAIT LIST. The organizer then manually selects and approves the players. Once a player is approved they will receive an updated status email. Be sure to read this carefully.  If not approved you remain on the WAIT LIST.  It is not bad to remain on the wait list as should someone cancel, the organizer can then change your status from WAIT LIST to APPROVED.

If you don't get in, you can also set up a PUG that meets your needs.