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If you want to create your invoice as a PDF for printing, edit it in LibreOffice or assign another document layout in .dot or .odt format instead of sending it by email, you can do this under (13). More about document layouts can be found in this chapter.
You can also enter an immediate payment using the multifunction button (13). This means that the customer pays the invoice in cash on the spot. The cash payment is collected in a cash register. If you select this option and click the button, a window opens in which you can specify which cash register should be used to collect the money. Make sure that the corresponding cash sheet is open.
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Down payment and partial payment invoices entail transfers of VAT. You can find more information on this in the chapter"Finances > Recording VAT correctly".