How do you round gif corners?

[Khusbu.Patel]

I've been trying to figure out how to round gif corners but all the tutorials for round edges are for images or don't have a visual for what to do.

I'm working with premade gifs and I know how to use the rounded rectablge tool. I get to making the shape, but it never removes the excess and when I got to save it, it's the same gif with sharp corners. Help me please. 

From the first step, all the way to when I save the gif would be helpful. 

[JJMack]

Gif can supports transparent pixels that is empty pixels.  Supporting transparency maps empty pixels that reduces the number of mapped colors by 1 The GIF can only have up to 255 colors then down from 256....

PNG is a better option  they Support color and partially transparent pixels but GIG can be animaten in all browers onle some browsers support animated png