Main toolbar > Open Track View > Select keys in the Track View Edit window. > Track View toolbar > Slide Keys
Graph Editors menu > Track View > Open Track View > Select keys in the Track View Edit window. > Track View toolbar > Slide Keys
Use Slide Keys to move a group of keys (your selected keys plus all the keys to one end of the animation). The direction that you drag determines which group of keys moves:
Dragging to the right moves the selected keys, plus all keys to the last key of the animation, forward in time.
Dragging to the left moves the selected keys, plus all keys to the first key of the animation, backward in time.
Slide Keys is a way to split the animation at the selected keys and spread the ends apart. Slide Keys is available in Edit Keys mode.
Procedure
To slide a selection of keys:
On the Track View toolbar, click Edit Keys.
Click Slide Keys.
Select one or more keys.
Drag to slide the keys to a new location.
Interface
Slide Keys: Slides the selected keys forward and backward in time. Dragging to the right moves the selected keys, plus all keys to the last key of the animation, forward in time. Dragging to the left moves the selected keys, plus all keys to the first key of the animation, backward in time.