can anyone show me how to conf VLAN assign,mac-auth-bypass, and redirect url?
For VLAN assignment see http://www.rfc-editor.org/rfc/rfc3580.txt, the other features you mentioned are specific to your NAS model and vendor, so I suggest you contact their support centre or read through the manuals included with your NAS.
If you want information on inserting or modifying attributes see `man unlang`