For trailsss make sure you have the grid on and hold your finger on the black space in the bottom left corner for a couple seconds, the grid should turn green and then you can use trailsss.
Comment found on PHHHOTO - Look Alive: to change photo capture frequency...
You need to turn on the grid then press and hold the black section (like hailey huskey picture). The grid will turn green now youre in trailsss effect.
Comment found on PHHHOTO - Look Alive: to get the effect demonstrated...