Git is great for being able to rewrite the commit history. However, you should not modify commits that have been pushed to a remote unless you are an expert with git.
Assuming the commit in question has NOT been pushed, when you make the second commit (to fix the first), open the commit options and select "Amend latest commit".
If you need to make modifications to your history farther back then the latest commit, you can do a mixed reset (right click the commit you want to go back to), and then re-commit the files/chunks you need. There is also an interactive rebase feature that would be worth researching that might be safer, but I haven't used it.
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