Please make me able to set the alarm reoccur every x days
“Cyclic” is probably not what you would think of for setting an alarm that occurs every x days. But I think “Cyclic” is what you seek.
When you press the icon to add a new alarm, I hope you will try the “Cyclic” alarm, and then post whether that is what you seek.
The Cyclic alarm lets you set a time of day and has an option to repeat every x-days (Look for “Repeat alarm”). Then you can set the number of days (Look for “Repeat every…”).
I hope you will post back to tell us whether this is what you seek, or what the difference is between “Cyclic” and what you seek.