"Frosted Glass" blurs the whole picture by applying noise. When applied, your work will look like as you're seeing it through a frosted glass. There are three types of frosted glass filters: "Normal", "Zooming" and "Moving".
Tap ②Filter from ① Tool Selection window .
Tap ①Frosted Glass . Set the Radius and Variance as you like and tap ②✓button .
And you're finished.