If you want users to be redirected to a specific page after completing a Form, you can use a return address (URL).
To do this go to Dashboard > then Online Registrations
Click the link icon on the Form you would like to set a return URL.
A small text box will appear beneath the words "Create a link with a custom return URL..." Enter the address of the web page you like the user to be redirected to after completion of the Form, then click Create Link.
This will modify the link below to accommodate for the return address. Copy this link.