What is the link to the previous thread you are referring to? We don't know what you looked at.
And you also have not explained your situation enough. What's the story on why you are updating mailing address, and where are you trying to update it?
Are you referring to the mailing address shown on your return?
Did you previously enter an address in the My Info section and now want to go back and correct the address?
Or did an old address from last year transfer in to your 2020 return, and you need to correct it and provide a current military address?
I can show you screen images for how to enter a military address for the mailing address in the My Info section, but I want to be sure there's not something else to the story first.
