Need Help!!!

My description is not very long but it clears up what i need help with.

Hi, I just got a 5gb dual sim device Model: Z8105AX. I have no idea of wrt and i just got to know it today the site is very weird and confusion like what should do where should i put the password and setup a stable good connection there is no Lan support and its just to much gibberish that is going over my head.

I needed a device with good range and 5g capabilities so i got this one but its very confusing and not very understandable. I just need to setup the device and also want to know abt the website OpenWRT as I am very new to it. Plz Help in this case i am just on a level zero. there are also no tutorials for this either that i can watch and learn from so yes i need to know of how can i use the device and the site.