Make sure that the cube is solved first before putting on the tiles. :3 I'm guessing it's a Meffert's cube with tiles?
Since the risk of putting in the tiles wrong isn't small (unless they're all center pieces, then you can directly put them back on. Tbh photos WILL help) if it can't be solved then it might as well be disassembled and reassembled, and there are YouTube tutorials for that.
lol, here to help ^_~