Can someone tell me the way to use my coke reward points to get my trial pass

If they still offer Gametap passes you will have to redeem the points on the Coke rewards site. Once you have done so you should get a promotional code or Coke rewards code of some type. Once you have this code you need to sign up for a TapID and during the registration process you should see a spot at the bottom of the screen to enter the promotional code you get from Coke. I think some of the Coke rewards codes give you a buy one get one free type offer so after the .99 cent first month you get one free month then the Gametap billing will start at normal price $9.95 a month unless you decide not to keep it and call customer service to close the account.

you have to click the upgrade to gold link in the top left, then you can enter the promo code

What Emperor Kought said, not Slevee =)

seems to be a running thing about me being right by this point.