The main is to try to explain them the benefits of Wave3 program.
Giving them an info that becoming WAVE3 member is easy and gets you many benefits like 5 free T-Credits with which can they bid at TripleClicks and also win some great stuff.
Letting them to know that they will also get 50 MRP's every month, and that they could win some extra T-Credits and MRP's or even $250 in weekly cash drawings if they refer others to also join WAVE3 program.