Hi there - since we don't provide email hosting or forwarding services, you can either:
1) Set up MX (mail) DNS records that would point your domain's mail to another provider, where you could then set up email forwarding to your Gmail account.
2) Transfer the domain to another provider that may offer email forwarding.
Here are instructions on adding email and transferring a domain to another registrar.
Just let us know if you need further help.