Welcome to the forum. First, what chassis do you have? ...and what year?
I'm kind of assuming maybe a Ford E-450? If so, are you referring to the fuse box in the engine compartment? ...or inside under the dash?
If in the engine compartment, from what I can remember, there are 2 push clips on each side of the cover on the left side. It sounds as if you have found those? Push them in at the same time and lift just that left side of the cover up and to the right. It should be quasi-hinged (clip hinged) on the right side. I'm just going by a faint recollection so I may be way off base. Or you may not even have a Ford chassis.
Maybe give us some more information about your chassis or take a couple of quick photos with your phone and post them here in your next post in this thread.
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