Addition of MIB for new cisco meraki switch

Hello, guys I’m in need for your help! I bought new meraki switch (ms220-8p) to play with Connected it to NAV with SNMP v1/2c. it says that the test is successful, however the port information is not shown, and it fails on write permissions. I think this is because I need to add it’s MIB to NAV. Can you please guide me to the resource which describes how to do that? I lack knowledge in programming and also my Linux knowledge is basic. Thanks in advance, David