Steps to remove/changes in last pushed commit

1. Get the commit id on which you want to go

git log

1. Reset on that commit and this will unstage all the changes

git reset <commit id>

1. Now do changes in unstaged files
2. To push changes in branch, you have to force push this time

git push origin <branch name> -f

1. If you removed the commit, it also removed from server too.

That's how you can do changes even after doing commit