Although changing the order numbers in your account is not a feature available to users, we can change the starting order number in your account. Since a new Pressero account starts with 1 as the starting order number, subscribers often like to set that to some higher value once they have finished testing setup in their account.
Please open a ticket to us at Support
as it would require the attention of our Dev team and specify what number you would like your orders set to. It can only be numbers, not letters or symbols. Order numbers are site wide and apply to all sites in the Pressero account.