Gear oil leak on final drive of farmall 140

I have an oil leak on the left side of my final drive on my farmall140. I will change the gasket on the lower oil pan that connects to the drive underneath the tractor near the back tire. My question is where do I add gear oil to the final drive. I saw a plug and tried to remove it with a 1/2 rachet and it did not budge, so I left it alone so I would not break the plug. Any soggestions would be appreciated.
Thank you...
 

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