Adding cost of shipping after auction

[HellsBellsnBucketsofBlood]

I just sold some electronic equipment on EBay. It was down as collection only, but the buyer wants it shipped to him at his cost (which I am perfectly happy to do). But how do I add the shipping cost now? I want it all to be done through PayPal.

Go to "send invoice" and there should be an option to amend the postage costs. If not then send them a PayPal invoice for the postage cost.

Thank you