Make sure you are logged into Backoffice.
Click Configuration -> Locations & Receipt Information.
Click Create Location.
The first line is what this location should be called in Backoffice. This is useful if you have cash registers in several different locations or cities. On the second line you mark which cash registers should use this receipt information.
All the fields below will be shown on the receipt itself. Automatically the receipt will fetch information from your company details. If you'd like to manually enter information, uncheck Copy Company Details and you can freely type in the fields. This can be useful to you if your company name is something different from the store name.
Note that you can also upload a logo. This will always be in black and white, since thermal printers cannot print in color. See an example below of how this might look.
Click Save Changes when you are done with the receipt. Log out and back in to the cash register and it will update the receipt with your new details.