You don't you mud it in (fill it with joint compound) and sand paint etc. The corner bead is embedded in the drywall, covered with mud and will be a big job to pull that off and change out.

Carefully tap the bead back in place with a hammer and a block of wood and nail the very outside edge at an angle away from the drywall. A small brad at least 1-1/2" long,carefully nailing it into the framing.If you can, slightly dent it in and then fill and sand.If it's small enough, spackling compound will work, so you dont have to buy joint compound that has a small shelf life and is hard to find in small amounts.You can buy small spackling containers, slightly more than what you'll need.Be careful not to overnail or nail too tightly, just enough to slightly indent the bead.Too much and you will buckle the beading above or below the bent area.

hey Tom999,

Thanks for the reply. I REALLY bent the bead pulling out that hardware. I plan to skim coat the whole room so mudding won't be the issue but I'm afraid I'm going to end up with a curved overhang.

I really want it to be perfectly flat- no texture to hide errors.