Hi Anne
Presumably you have made a purchase which offers cashback and you received a receipt or invoice for the goods that you bought.
Do you have a printer which is linked to your computer at home?
If the answer is 'No' then your best course of action would be to visit your local library, take the receipt or invoice along, write down the website which is offering the cashback so that you can remember it and the library staff should be able to help, unless you have children or grandchildren who have printers with their computers.
If the answer is 'Yes' then check your printer to see if it is a printer / scanner.
A printer / scanner will have a hinged lid which lifts up to reveal a glass (or clear plastic) surface underneath
If it is a printer / scanner you will need to get into the printer programme from your computer.
1) Left click 'Start' on your computer then 'All Programmes' (all mouse clicks are left click unless otherwise stated)
A list of the programmes which are on your computer will appear.
In this list will be the name of the printer machine e.g. 'Lexmark'
2) Click on the printer ( sometimes all you need to do is to 'hover' the mouse pointer over the name of the printer)
Another list ( or menu) will appear.
3) Have a look to see if there is a User Guide or Instructions, click on them and have a read through to familiarise yourself with the printer.
4) After you have checked if you have a printer / scanner and read the User Guide get back to me and we'll go through the next bit