Unused reservations on eki-net using JR pass

I�fm travelling to Japan in a couple weeks and I used JR East�fs Japanese eki-net service to book many of the trains I�fll be taking here. I�fm using JAPAN RAIL PASS and I�fll be showing it upon pickup of limited express reserved seat tickets so I won�ft be charged for them. I wanted to change some of my reservations but I understand that there�fs a fee for cancelling a reservation. I�fve lived in Japan before so I know that it�fs best to cancel the unused reservations but wouldn�ft I be charged if I cancel the unused reservations on eki-net? Do you guys know if there�fs any way for me to cancel for free? (If not then I�fll just pick up the tickets and throw them away.)

There are fees for cancelling a reservation but not for changing it (e.g., changing the date/time).

You can't cancel for free from eki-net, but probably you can cancel after picking up the tickets.