Cubase works best with an audio card that is ASIO capable (latency and connection issues if not ASIO compatible). So, it is likely that the audio card in your laptop is not.
If it was, you would be able to see and add the mic location as an input buss when you are in Cubase’s “Devices>VST Connections” menu.
To start, download and install the free ASIO4all driver. Choose it in the “Device Setup> VST System Link” menu. Then check the “Devices>VST Connections” menu to see if you can set up an input buss for you mic. If not, I’m afraid, you will probably have to purchase a audio interface that is ASIO compliant. They are not that expensive.
Here is an example of what they look like. There are many different units available. Just search for “audio interface” to see a bunch.
Also, review this forum topic. Maybe it will assist you:
Good luck 
Regards 