Open port 443 to make the tunnel from an external network

I’m new and I don’t know if I’m in the right section for my problem …
My problem … is that I can’t get the DMZ to use port 443 for SSH on Mikrotik, being the first one I buy.
I explain the problem …
I have the Internet service provider that provides me with a Mikrotik internet and they have opened port 443 on their Mikrotik.
I connected my Mikrotik but I can’t make the tunnel to connect remotely from an external network.
I phoned the Internet service provider and they told me that I need to open port 443 on my Mikrotik doing DMZ with IP 192.168.1.2 behind my Mikrotik …

I tried many ways but I can’t connect remotely from an external network.

The data are :
IP Internet service provider = 192.168.1.2
My IP = 192.168.2.1
Internet service provider open port 443
Door closed Internet service provider 22
Question how to run DMZ on Mikrotik?
I hope I explained …