How to use ClearFog LX2-Lite Developer Platform uSIM module?

I plan to develop an application which will use a 5G uSIM. And I find the ClearFog LX2-Lite Developer Platform having a uSIM module.

link

I want to know how to use it? Is there a 5G modem(mPCIe) needed?

yes, either an mPCIe or m.2 5g modem would need to be added to the platform.