You just add them in the switch port configuration. If you want a trunk you choose the native VLAN and all allowed tagged VLANs. You can choose all or individual or ranges like: 10-20,31 If you make it access port you can choose the access VLAN and a voice VLAN that will work with CDP/LLDP devices.
At default every port is a trunk with native VLAN 1 and all VLANs allowed.
If you intend to route between VLANs then see this next: https://documentation.meraki.com/MS/Layer_3_Switching/MS_Layer_3_Switching_and_Routing#Initializing_...
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