Did you mean to say "How can I remove..."? In the Library, find the item. Tap the Checkmark icon at the top of the Library, then tap the item to select it, then tap "Delete" at the bottom of the Library. This will delete/destroy the file in the Library. Be sure you have original item on hand somewhere else on your eDGe before hand. (I highly recommend you always keep originals of all files added to the Library in another place like your PC, or a USB memory key, for example.)

If you don't have the original on hand, you'll have to use ES File Explorer to copy it out of the Library protected storage folder first. If this is the case, please ask for further instructions.