You push this button here and scan.

Went out to get some shopping and as Euan needed the toilet thought I would get a trolley inside. There were only the shallow trolleys inside so I took one, rather than traipsing back outside to get one with a proper seat for Rhona. She sat well in it and Euan joined her to start with. He likes to help scan the shopping with the new self scan system so was happy to get back out again. I like how he looks like he is explaining how to use it to Rhona!