Are you referring to applying for clearance to be legal, or unlocking the drone because it's preventing you from flying?
I assume you don't have a part 107 license so you're flying strictly as a hobbyist.
With the former, use LAANC in Airmap or Kittyhawk to get approval to fly in controlled airspace. Hobbyists cannot get waivers. They also cannot get approved to fly higher than what the grid shows in the FAA facilities map, which also appears in the two apps I mentioned.
With the latter, that depends on the color of the zone your in on the Go map.
Unless you're very near an airport, prison, etc, or under a runway approach path which shows in red or blue, you'll just be prompted to agree to responsibility with 3 check boxes and OK button.
If you are in red zone, you won't be able to fly there at all. If the map is wrong about that, you can appeal to flysafe.dji.com.
If blue, it will show NFZ on remote and app will show you can't fly. Attempt to launch anyway. You'll then be prompted to "authenticate" yourself (really prove you're a human adult) by providing a cell number to receive a texted code, or a credit card. You will need internet here. Once you've authenticated, you'll need to accept responsibility with check boxes.
Grey zones are similar to blue, but with height limitation.
Note of caution: you may be prevented from crossing zone boundaries, especially flying into restricted areas from outside them.