Hosting a pre-existing meeting 2hours before meeting starts.

Hello.
I wonder if anyone can suggest a way for me to open up and run a meeting on zoom.
I have been given the id and codes for the meeting (which officially starts at 8.30a.m), but we wish to use the space from 6a.m
I am signed in as my account, but cannot find any page which allows or permits me to become host of the meeting (only my own private 45 minute meeting)
Im sure theres a simple solution, many thanks.
Graeme.