how to copy data after userform button selected

Hi, I'm creating a POS system for my pub and I hit a brick wall.

I created userforms with selection buttons where I can select different products to display on the "wrung up sheet", but I can't seem to get it working. How do I select a button and have the product name fill the cells(wrung up sheet) displaying the price next to it and the more I press the same button, the quantity must increase.
I have googled and found no answer, I'm using excel2010

Can you supply a copy of your workbook along with a detailed description on what information you want to go where?