I did this POST message configuration damage to my wifi internet, help

[riveramoncada]

My ISP is Tigo Une from Medellín, Antioquía, Colombia i reset my modem before everything i will say in this POST message i did, i have a ARRIS TG2482A model name modem and when i entered in its configuration in " Lan Setup " -> " NAT " To " Nat Mode " i changed my configuration to " Bridged " how can i change my configuration back to its previous settings ?

 

[Baluncore]

There should be a small hole with a reset switch on the back of the router, near where the cables enter.
Google: ARRIS TG2482A factory settings