FortiGate with PPPoE and Ap setting problem

Hello.

Im new in setting up fortinet AP so I have a problem. I have FortiGate model 30e and 2 AP model FAP14C.

So my internet provider use PPPoE protocol I set my FortiGate with username and password and now i have internet, but I don't know how to set up the Forti AP. In my office the provider use DHCP and there everything works fine. but at home with this PPPoE the AP doesn't have internet. Can someone to tell me what i need to set on this AP to have access to internet. Thanks