Override User Definition Variables jMeter

I have a simple test-plan in jMeter. 1 step - Go to main page of test site (need to token get ).2 - step - some users try to register on. I have 2 thread groups for 1-2 steps, because 1 step need only one user, and 2 step need more 1000. So, I need to get token from 1 thread and pass it to second, like this :

But I don't understand how to implement it. Could someone help ?