Hi there, Linda!
According to the Cast Member at
Disney's Magical Express (DME), you're permitted one trip from Orlando International Airport (MCO) to Walt Disney World on or after the day your reservation starts, and one trip from Walt Disney World to MCO on or before the day you check out.
Just call Disney's Magical Express at 407) WDW-MAGIC (or dial 0 from your Resort room phone and ask to be connected to DME), and let them know the day and time you wish to return to MCO.
The one:one rule is in place, obviously, to prevent people from using DME as a taxi service. But you will not have any issues if you work within the parameters of the one:one.
Have a great visit!
See you later, celebrator,
-Deborah B.