Ok I will try to help. You have two layers on a 2x2. After OLL, each layer will either be a skip, a J-perm (Or any adjacent swap PLL), or a Y-perm (Or any diagonal swap).
Case #1 One layer is a "J-perm", one layer is solved. Move the J perm side up to the top (if it is not there already) and solve it like a 3x3 J-perm or T-perm (Or any adjacent PLL that you know)
Case #2 One layer is a diagonal swap, one layer is solved. Move the Y perm side up to the top if it is not there already. In case you don't know the Y perm it is F R U' R' U' R U R' F' R U R' U' R' F R F'.
Case #3 Both layers are "J-perms". Position both of the bars at the back of the cube and do R2 U' R2 U2 F2 U' R2.
Case #4 One layer is a "J-perm", one layer is a "Y-perm". Put the diagonal swap (Y-perm) on top. Position the bar on the bottom to be on the left side.
Then do R2 U R2 U' R2 U R2 U' R2.
Case #5 This is the easiest case. Both layers are Y-perms. Do R2 F2 R2.
Hope this helps!