My toenail is about to come off

First, we need to know why it's coming off. Do you have a nailbed infection? Did you have an accident and rip it off? Tell us the cause.

Second, just yank it off. Expect some bleeding, so you might want to be in a bath tub.

Third, poor hydrogen peroxide on it. It's going to burn. Then rinse the HP off with regular water.

4th - apply some neosporin, with pain reliever, and bandage with guaze and tape.