Step 1:
Get in the web interface of your in hand router using the IP 192.168.2.1

Step 2:
Use default/your username and password to log in to it
Default username: adm
Default password: 123456

Step 3:
Go to "Network" ---- "Cellular" to open the SIM card setting section.

Type in a number for index and type in the APN(see below) of your card. Then press "add"

Select your APN profile that you just created, select "profile 1" in "SIM1 Network Provider"
Finally, press "Apply" to apply your change.

APN:
From our Card
ROTN APN : data641003
Rogers APN : data641003

From Bell card
APN: mnet.bell.ca.ioe

From Rogers card
APN:ltemobile.apn