How to Change ur cycle on here...

Amber • My name is Amber,and we have been trying for about a year...but my cycle is everywhere...im hoping this will work...fingers crossed...
Sorry Ladies might sound like a silly question but how do u change ur cycle on here...i use to be every 2 months but now im starting to be every month...so i need to see when im fertile...is there a setting button i use...im new to this...but very excited my cycle is regulating...