It changes to Edit Animation mode.

Animation list can be only edited in this mode.
Nodes and Inspector can't be edited in this mode.

You need to add new animation on Animation List to timeline be settable
On this panel, you can set keyframe on timeline to make animations.
Each parameter, and each axis of parameter has a line for it.

Scroll wheel
To slide timeline vertically

Shift + Scrool wheel
To slide timeline horizontally

Right click on X and Interpolation
To change interpolation between Neaest, Stepped, Linear and Cubic.

Right click on X and Merge Mode
To change Additive, Multiplicative and Forced (fixed on last one).

Right click on X and Delete
To delete all line of parameter.

• Lock playback to animation framerate
• Stop
• Play
• Frame
• Animation time

You need to have created parameter on Edit Puppet mode
On this panel, you can slide on parameter you created to position value for keyframe of animation. To set keyframe, you need to click on + icon after positioning.

On this panel, it's listed all animations of puppet.

Click on + to add new animation.

Right click > Edit

• Rename
• Options
• Additive
• Weight
• Frames
• Lead In
• Lead Out
• Framerate (25, 30, 60, 120 FPS, or custom)
• Total time of animation

Right click > Delete
To delete animation.