I use BitBucket and had to change my password because it was compromised.
remote: Invalid username or password. If you log in via a third party service you must ensure you have an account password set in your account profile.
fatal: Authentication failed for 'https://bitbucket.org/myusername/myproject.git/'
How can I change my password using command line?
You need to reset the password as shown below.
git config --global credential.helper osxkeychain
On Windows 10:
git config --global credential.helper store
After executing this, it prompts you for the user name and password for your repo.