I do not understand how to get previous week or get

I do not understand how to get previous week or get I to say next month?

Shortcode:[app_pagination]
Description: Inserts pagination codes (previous, next week or month links) and Legend area.
Parameters:
step: Number of weeks or months that selected time will increase or decrease with each next or previous link click. You may consider entering 4 if you have 4 schedule tables on the page. Default: "1"
month: If entered 1, step parameter will mean month, otherwise week. In short, enter 1 for monthly schedule. Default: "0"
date: This is only required if this shortcode resides above any schedule shortcodes. Otherwise it will follow date settings of the schedule shortcodes. Default: "0" (Current week or month)