I have people wanting to buy several items and want me to send an invoice but I don't know how to do

Hi.. I don't know how to send an invoice to buyers on my site. I need an idiots guide please? 

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Click on Send Payment Details, far right of one item on your sold page (you may have to click on "More Actions" first). The other items will be on there. Make sure they're ticked to show you're combining, then change the postage to what you've decided to charge and submit (don't click on reset if it's there).