You can do it easily.
If your ticket was purchased with Armas Trasmediterránea before the integration, you can request the date or time change directly on your booking.
Once the change is made, you will receive confirmation with the new date and/or time of travel.
Does changing the ferry date have a cost or change the price?
No, changing the date or time of your ticket has no additional cost.
This type of modification is made without penalty and without changing the original price, so you will keep the same conditions of your booking.
You can do it with complete peace of mind: only the date or time of your trip is updated.