I want to increase the amount of gigs/dollars after I placed an order



I just have placed an order on Fiverr. A amazing guy wants to help me translating some English documents in French. I placed an order of 1 gig (5 dollar), but the total amount of the order is 56 gigs (280 dollars). Therefore I want to increase the value of the order. Is this possible?

I see the options to book some extra’s. However, these can not be selected all at once or more amounts of 1 extra option (in order to have a total 56 gigs eventually). How do I increase this order from 1 gig to 56 gigs?

Thanks a lot!