Your kit should come with four M3x14 bolts, four larger rectangles of 1/8" black delrin plastic, and two slightly smaller rectangles of the same material. The four larger rectangles will be the actual handles themselves. The two smaller rectangles will function as a nut for the bolts to thread into.
Take 2 of the larger black rectangles and stack them on top of each other. Place a bolt through one set of holes. Then place the end of that bolt through one of the holes located in the middle of the side panel. (Shown in the first picture.)
Take one of the smaller rectangles and line it up on the inside of the enclosure with the bolt you just inserted. Use your 2.5mm allen key to turn the bolt clockwise while pressing it against the plastic nut. Your bolt should thread into the nut as you turn, but might need a small amount of pressure to start. (Shown in the second picture.)
Repeat that same process with a second bolt in order to secure the handle horizontally.
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