Hello from America, I purchased this ax1800 router. My problem is I thought with my T-Mobile microSD card I would be able to plug it right into the TF card slot, but that’s not the case people I truly need your help. How do I set this up for cellular router? Can you help me please. I’m new to this product.
microSIM card? It should work out of the box, by simply putting it on the microSIM tray of the router. T-Mobile should configure the SIM automatically in its first Network connection.
First thing first, microSD (TF card) and microSIM card (Sim card) are two different things 
Second, the AX1800 (Flint1) the AXT1800 (Slate AX) are NOT cellular routers (4g/5g routers) aka routers that use mobile operators waves to serve you a wifi connection, for that look at:
GL-X2000,
GL-XE3000,
GL-XE3000,
GL-E750,
GL-X750,
GL-XE300,
GL-X300B
Hope this helps to clarify 
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AX1800 ( Flint ) router does not have micro sd card slot.
If you are talking about AXT1800 ( Slate AX ), micro sd card slot is not for cellular SIM card, it's for storage card only.