*IMPORTANT* For monthly gifts, you need to select the monthly amount, not the total amount. For example, if someone wants to donate $20 per month for 6 months to reach that $120 level, you'll select $20 and then "monthly" from the dropdown menu.
Please also note that if a donor already has a recurring donation through PayPal that they'd like to update, they will need to log in to their PayPal account directly to change it.