Keyframes change from smooth to linear - can't choose diferent keyframe

I know you have the transform tool and there it shows the keyframe so you can right click and change from smooth to linear, but when the motion is repeated several times. ( ea. in a horizontal movement back and forth) you can only right click the last keyframe. the others "under" the last keyframe that have the same position are not reachable to right click on them. Is there another location or window where all the keyframes are listed so I can easily right click other than the last keyframe in the same position. My video slides back and forth several times between 2 positions - "A" and "B" - Key1=A, Key2=B, Key3=B, Key4=A, Key5=A, Key6=B, Key7=B e.t.c.-- I set all the As first, then came back and did the Bs, now there is a motion from A to A and should be static between the As. I want to set them to linear. but can only rightclick select Key6 for the A position and nothing below that, I can't rightclick Key1, Key4 nor Key5. which are all in A position. Please help!!!!!