Status bar > Time controls > Key Mode
Key Mode lets you jump directly between keyframes in your animation. By default, Key Mode uses the keys visible as gray circles in the track bar below the time slider. Other options are available on the Time Configuration dialog.
Any time you have the Animate button turned on and you have made a change to an objectÆs create parameters or performed a transform, or have changed a material or any modifier applied to that object, you have created a keyframe. Key Mode can respect all keyframes, or it can be limited to move to only transform keys.
The Key Steps settings in the Time Configuration dialog determines this. When Key Steps are set to Use TrackBar, then Key mode will jump ahead or back to keyframes of any type. When Key Steps is not set to Use TrackBar, Key Mode will respect only transform keys.
Procedures
To use Key Mode:
Turn on Key Mode.
The button turns blue when key mode is active.
Use the Previous Frame and Next Frame buttons to move from one keyframe to the next.
If you are not jumping to the keys, be sure the object is selected in the viewport.
If you are still not jumping to the keys, configure Key Mode to Use TrackBar.
To configure Key Mode:
Click Time Configuration. You can also right-click the Key Mode button.
Select options in the Key Steps group.
If you turn on Use TrackBar and turn Key Mode on, then clicking Next Key advances to the next key for the selected object. This will respect every type of key that appears in the track bar. If you turn Use TrackBar off, only transform keys are used by key mode.