I just did a search and found this driver: GitHub - ithinkdancan/hubitat-meross: Hubitat Drivers for Meross Smart Plugs
Is that what you are using and did you follow the instructions?
Yes you will need to create a virtual device, then select the proper user driver that you installed.
Once you do that it should have some options to provide a device IP or key of some sort so it knows what device to talk to. The instructions have some info about getting keys/credentials.
There is also this thread I found: Meross
