Editing Gifs

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I can add text, but I don't know how to limit them to certain frames,

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What you do is create a new layer above the particular frame on which you want to add the text. Add text to the new layer, then merge that text layer down onto the frame. To add the same text to multiple frames, create the new layer, add that text, then create duplicate layers of the text layer, move each duplicate over a frame and merge down.

I use Photoshop CS3, but I'm sure other programs would work similarly.