Go to my eBay sold section, find the item in question, over on the RHS of page you will see a link that says more options. Click on that and select resend invoice or send invoice, (not sure of the actual wording)
If you are making changes to it. Do not hit the recalculate button. Just make the changes then to check it's ok, down the bottom next to the send button you will see a preview link click on that.
