These are options for the current frame (the frame shown highlighted in the Frame Gallery).

Name

When you create a frame it is allocated a default name. Use this field if you want to give the frame a different name. (For example, to remind yourself what the frame shows.) Frame names are only used in this program; they do not appear in the Animated GIF.

Background/Overlay

These duplicate the buttons on the Frame Gallery. See Background and Overlay Settings for more details.

Display frame for

This lets you specify how long you want this frame displayed before moving onto the next frame in the sequence. You can also set a global delay that applies to all frames in the animation using the Loop & Speed tab.

Show Frame

Select this option to include the frame in the final animation. If you want to exclude the current frame from the animation, deselect it. You can also change this setting using the pop-up menu in the Frame Gallery, just right-click on a frame.