You can create an unlimited number of payment forms as well as upload an unlimited number of logos.
To do so, in the backend office click "Settings" and select "Look & Feel" in the drop-down menu. Either click "Add a new profile" in order to create a new profile or adjust the existing profile by clicking on the pencil icon below the "Action" sign.
Click on "Upload Logo" after you have either chosen to "Add a new profile" or to adjust the existing one.
You can choose if your Logo should be displayed square, rectangular or round.