drop a clip on the time line
edit the in and out points
if you click between the in and out points you can drag the clip around, forward and backward on the time line.. ( obvious)
if you click on the footage OUTSIDE the start and end points, you can "slip" the footage forward or backwards by frames without changing the length or position of the in \ out points..
easier done then said..
EDIT: officially this is a slide edit. A slip edit is completely different