How to change westell 327w firewall settings

Hello
I am using westell 327w router i want change firewall setting of my router can anyone know how change that ?

Thanks

The firewall setting on this router controls all outbound traffic initiated from within the local network. In such instances where the application is initiated from outside the local network, you will need to enable the appropriate port forwarding services. Please refer to Tab 5 for instructions on enabling the port forwarding in this router.

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To configure the Firewall for a different level of Security, click the radius button associated to the level you desire.

NOTE: If you select Custom and “edit”, your modem may not function correctly. This requires line script programming - if done incorrectly the router will need to be reset.