Once have you add your support email in Richpanel, you will get a forwarding email address in the screen shown below.
Now, if your email is self-hosted (not hosted with email service providers like Gmail, Yahoo etc.) then you have to set up the forwarding from the email host you are using.
This setup process varies host to host. You can browse the help articles of your host or get in touch with their support for the setup instructions. Here we have collected links to the setup instructions for some of the major hosting providers.