Stronglifts: 5x5 When to Workout (Android)

You do three workouts per week, with at least one rest day in-between.

Most people train Monday, Wednesday, Friday. But you can also train Tuesday, Thursday, Saturday. Or Sunday, Tuesday, Thursday.

You can set your training schedule in home - edit - schedule.

If you set 3x/week, StrongLifts will automatically alternate between 1 day on, 1 day off, 1 day on, 1 day off, 1 day on, 2 days off. If you skip a day, StrongLifts will automatically update the date of your next workouts.
If you set fixed days, like monday, wednesday, friday, then StrongLifts will automatically schedule your workout days on these days. If you skip a day, StrongLifts will automatically shift your workouts to the next monday/wednesday/friday (or whatever fixed days you picked).