Keyframes Panel
From Synfig Studio :: Documentation
The "Keyframes" panel is where you make new keyframes for the animation.
These will show up in the Timetrack dialog. To jump to a specific keyframe, double click on the Template:Literal(JMP) column.
The Add keyframe button adds a new keyframe to the current frame - a frame where there is no keyframe set already.
Remove keyframe removes a keyframe.
The Duplicate keyframe button copies the keyframe to the current frame.
The Keyframe Properties button display the Keyframe Dialog of the selected keyframe.
Take a look to http://wiki.synfig.org/wiki/Keyframe#Adding.2C_duplicating_and_removing_keyframes
