Fortiwifi

Hi

 I have a fortiwifi and need to create 3 vlans and 2 WiFi.  My problem I don’t want to use the preconfigured WiFi that came with it.  I want to create separate vlan tunnel and make it a WiFi.  How can I do that. 

2nd things how can I turn the default ip 192.168.1.99 to a vlan?  I want to create a corporate Vlan but the default ip is not a vlan

thx