You need to setup APN (access point network) in order for 4G LTE Router to connect to the Internet. APN will depend on your wireless provider.
For T-mobile the APN is: fast.t-mobile.com, for AT&T APN is: Broadband. You may have to create a new APN profile first. To do that go to Settings -> Dial-up -> Profile Management. Click ‘New Profile’, enter the name of the profile, for example tmobile or att. In APN filed type in APN for your wireless network provider. Click ‘Save’ and wait till profile is saved. Select your new profile from the drop-down under ‘Profile name’ and click Apply.
For the changes to take effect you need to reboot your 4G LTE Router. You can do so by going to System->Reboot.
Note: Once the reboot is complete, make sure you are connected to the routers Wifi on your computer. On the home page of administration console you will see status ‘Connected’.