This season, all Fortnite battle pass owners can access Deadpool's weekly challenges to unlock the Marvel superhero skin. You'll have two challenges per week that will allow you to unlock cosmetic in honor of the superhero. To access them, simply go to the battle pass tab and click on the ventilation grid at the bottom right. You're now in Wade Wilson's HQ. Week 7 second challenge is about entering a phone booth or portapotty.
Phone booths are used to dress as a henchman so that they ignore you. They're generally located near new locations or Shadow shelters. The same goes for the toilets. These blue booths are also located in each vault. Be careful: they aren't available in Team Rumble.