How can I get my paypal form to work properly?

When I go to submit a payment using the paypal form it redirects me to paypal but to log in not to collect money.

Please see this guide here http://www.jotform.com/help/50-PayPal-Forms to learn how to set up the PayPal Integration properly. 

Also, please be sure to set up your PayPal IPN to hook up to your jotform so that you receive notices of payments and so that it works as intended.