so here it is again,
1. Do your "c" fold
2. Also flatten the rest of the cup as much as you can so there's no air in it
3. Hold it flat for as long as you can or at least until the opening is inside somewhat, then push in to where is comfortable
4. It should pop open easily and not leak
So that is what finally worked for me and I hope it works for others. in the past I just did the "c" fold at the top to get it in and the rest of the cup was only have folded flat so I guess the air that went in was making it so that it leaked. Anyways, best of luck to you all, hang in there, once the cup finally works its like a miracle!!!!