How Do I Configure A Tp-link 3G Wireless Lite N Router

[victoradamu]

I need help!!
I just got a tp-link 3G wireless lite N router and I am trying to configure it to work with 3G as only internet source using an mtn sim loaded HSDPA modem.
I had to upload a new firmware to get the router to accept the modem.
The router now connects with the modem successfully and the status page shows there is traffic and packets are transmitted but the router connection as well as wireless connection does not have internet access.
Please I need help on how to get the router to get internet access through the 3G modem.
Thanks in advance.