Inside the wheel well, right at that point, it's actually hollow behind that body panel. You can reach around inside the plastic fender flare and get your hand into it. Mine collects tons of rocks in that space.
If you want to make a big deal out of it, you could undo the plastic fender flare, fix the metal, and then put the plastic back on. You might just be able to work around the plastic if you want to.
The fender flare is held on by screws. There may be one or two snap in connectors made of plastic. I forget if there are, and I'm not near my FJ to check. If there are, they look like big buttons, and the center portion pries out before the whole thing pops out.
Either way, you can reach in there with a pry bar and move it outward. You might also want to grab from the inside with a pair of channel locks and pull it backward.
