Click 'change' to input how many sides. Click 'Roll Again' to get a result. Click 'SAVE settings' to get two save codes. Write these somewhere safe. Click 'LOAD settings' to get a previous setting. Input your two save codes as asked. HACK: To load your roll and not have to go through the saving, input your 'Sides:' as save code 1, and your 'Roll:' as save code 2. OR: just put a space for save code 1, and your 'Roll:' for save code 2. This way you just get to see your roll.
Probably pretty easy to see how this works. There are things that can happen with loading rolls. Might delete in the future.