Go to Admin > Properties. Select your property, and on the left-side menu you will see Add Periods. That will allow you to add periods beginning with the period you enter.
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Permissions and Settings
To [action] you need permission to [name of permission]. To do this go to Admin > User > (Select User) > Change Permissions > [Settings Category] > [Name of Setting]
In order to [action], you need to [Description of Setting]. Click here to read how to set that up.