The reason your screen goes dim is an indication that it's about to lock the screen and I think it's to prevent burning an image in your screen. To edit/delete bookmarks I think if you go to your browser and hit menu> bookmarks> and long press on one of them.
If you have anymore questions or need any help, please feel free to ask or give us Guides a shout! Have fun and enjoy the forums.
EDIT: Here is a link to your devices area of support and sub-forums to learn more about your device and get help tips and troubleshooting. Acer A1
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