Can I add a day online to my BRP, or do I have to call?

[mouseclick1]

We just decided to add one more day to our trip. Can I do this through the AP site, or do I have to give WDW a call?
Thanks!

 

[srfrgrl07]

Yes, as that is considered a modification...unless you want to book that night alone as it's own reservation if you are still 60 days away.