Transmission leak

I found a white plug on mine not sure what it is but when you push on it it seems loose it clunks in but when it does transmission fluid comes out around it

You might need to post a picture of what you’re talking about.
 
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its green not white
 
What year is your TJ? Also please fill out your profile we can know what we’re dealing with.
 
I only rarely get to see that transmission, but one thing that you'll want to keep handy is the factory service manual for your year. It's in our resources section.