Hello, would you Tell me how to change the currency when entering an expense receipt on the app?

Hello Spencersophie-ho, so the currency will be based on the supplier's/customer's set up. If you created a supplier based in dollars, then the time that you create an expense using that dollared supplier, automatically, the currency of the entry will change based on the name of the supplier/customer.

 So when you first create a supplier at the very top the first thing it asks you is what currency the payments would be in then once you have selected this and saved it, you are unable to change their currency. 

It would be a case of having to make that supplier inactive and creating them again as a new supplier, so it has the correct currency showing for you.