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Add your cycle
Tap the first day of your last period.
Tap "Add Period" near the bottom right.

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Delete your cycle
Tap the first day of your last period.
Tap "Delete Period" near the bottom right.

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Edit your cycle
If you'd like to change the first day of your last period, delete your cycle and add a new one.
To change the length of your cycle,
Tap the last day of your last period.
Tap "Period Ends" near the bottom right.
