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I did check your form "Street Food Liverpool" and did not find any issue with that. It is already enabled and seems to work as expected. Are you getting any error message?
Please share the screenshot of the error message you see in your form and we will take a look. The following guide should help you how to upload image in forum post: http://www.jotform.com/answers/277033
If you want to edit the payment tool of your form, you will have to select the payment tool and then click on the wizard icon. Please check the screenshot below:
We will wait for your response.