You can create and manage your payment methods from the Settings > Payment methods menu:

You will find the list on the current payment methods:

You can create a new payment method by clicking on the ' + CREATE' button:
You can edit a payment method by clicking on the Edit button:
You can disable / Enable a payment method by clicking on the 'Disable / Enable' button:
Please note that you can also create your Payment methods directly when adding a payment in the invoice. Simply start typing the text and press enter or click on the underlined text:
