Incorrect allert regarding payment gateway for free sign up

On the dialogue for new sign ups for a free membership ( we are testing and pre-launch but live so we can test and start building viewers ) when people sign up for the only membership, which is free, they are alerted that they may have to wait for the payment gateway to process their payment.

That’s wrong. And it makes the site seem unprofessional and perhaps even fraudulent.

So where can we edit those dialogues?

It seems that the back and forth loads into the page.

So how and where do we control the dialogue with our subscribers.

Where is the detailed manual so that we can make a finished product?