I want people to be able to buy product if he already signed up for the website. Is it possible?
If someone who has already signed up for the website before should still be able to buy the product
yes it is possible…you can use ccaps to unlock a product for signed in clients who buy…maybe this will help you understand… https://s2member.com/kb-article/video-custom-capabilities-for-wordpress/
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Do you mean that you want to restrict the purchase of a product to people that have registered for the website?
If that is the case then simply protect the product purchase page to logged in users (s2member_level1 or higher). You will find a s2member metabox in every post / page that lets you set the page to be protected to only logged in users.
Sorry I didn’t describe issue properly.
The error message says: “That email address is already in use. Please try again.”
I solved it by removing that user.
Yes, that’s perfectly possible. You just need the person to be logged into his account when he loads the page where the payment button/form is. That way, the payment will be linked to his existing account, and not go towards a new signup.
The error message says: “That email address is already in use. Please try again.”
If the user is not logged into his existing account and tries to signup with the pro-form using the same email address, he’d get that message.
I hope that helps clarify it. 
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