There are some complications, because you are presenting the Internet and MPLS circuits on the same port using VLAN tags. You'll need to break these into seperate ports.
Lets pretend your provider is using the tag 2000 for the Internet circuit and 2001 for the MPLS circuit. You would need to plug this info an MX LAN port configured as a trunk port. You would then configure another port as an access port in VLAN 2000 and run a cable from that to the "Internet1" port on the MX.
How you treat the MPLS circuit depends on weather you want to run AutoVPN over it, as in this case:
https://documentation.meraki.com/MX/Site-to-site_VPN/Configuring_Site-to-site_VPN_over_MPLS
This is the most difficult to deploy case, but the most sophisticated and provides the most SD-WAN configuration options. If you used this case you would run a second cable in VLAN2001 to "Internet2" on the MX.
The second way is to treat the MPLS as a simple routed circuit and only use the Internet circuit for failover, as in this case:
https://documentation.meraki.com/MX/Deployment_Guides/MPLS_Failover_to_Meraki_Auto_VPN
In this scenario you would simply configure the VLAN2001 as a layer 3 VLAN on the MX.