If you only want to make minor changes like corrections of misspellings, it may be worth contacting the site administrators directly (see contact info in the INFO section of the help files). See also notes on step 4 below.
Scroll down to the bottom of the screen and click
on the SAVE button to submit your changes to the site administrators:

As the invoice address is part of your account application and approval
process, its change has to be approved by the body that approved your
original application. Until then, the original invoice will be used.