Using ChronoForm5 to access payment gateway eg paypal

Hi friends
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I am a long time user of chronoform5 and have been in the designer to access submit buttons, etc via Basic, Advanced groups. Recently i am thinking of signing up with a payment gateway because a friend want to be paid for some products. Where do i add this in the Designer section. Moreover I have zero experience in pay.gateway and hence have no idea how the gateway present itself.
Appreciate a quick push. Thank you.
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PS why a .jpg file can't be uploaded in this topics, it says can't be saved.

Just dig in and find the setup section where there are the "payment processors". But there seems to be a steep learning. Luckily i have the "demo" samples to help - demo Paypal-listener. So I have to learn from there i guese.