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 in the track bar below the time slider. Other options are available on the Time Configuration dialog in the Key Steps group.
When the Auto Key button on and you change an object’s creation parameters or performed a transform, or change a material or modifier applied to that object, the software automatically creates a keyframe.
Key Mode can respect all keyframes, or you can restrict it to move only to transform keys via the Key Steps options on the Time Configuration dialog. When Key Steps > Use TrackBar is on, Key Mode jumps to keyframes of any type. When Use TrackBar is off, Key Mode respects only transform keys.
To use Key Mode:
Use the Previous Key and Next Key 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, as described in the following procedure.
To configure Key Mode:
Click Time Configuration, or right-click any animation-control button, including Key Mode.
Choose 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.