Once you reach the required time for a drop, you will then need to follow the URL, link your Frontier account to your Twitch account, and then claim your reward.
This is not typically how Twitch drops work in my experience. Users need to be registered before the stream starts, its marked as eligible in the back end, and then as watch time accrues, the entitlements trigger. Handing out the URL during the stream is either
A. Not going to work
B. Only going to work for people who manage to get an hour of watch time in after the URL is posted after the stream starts, assuming it lasts for that long.
C. Or there is something I do not know about setting up Twitch drops and it will work retroactively.
I've seen enough devs mess this up before so I'm pretty confident there will be failures and hollow apologies but I could be wrong too. It would just be better if the URL was here, now.