Sourcetree Can't Push

[Benjamin Roope]

I am extremely new to the source tree (meaning I downloaded it today) and I tried to push out an initial commit and I got this error message:

git -c diff.mnemonicprefix=false -c core.quotepath=false --no-optional-locks push -v --tags --set-upstream Dragonfire master:master
remote: Invalid username or password
fatal: Authentication failed for 'https://bitbucket.org/BenRoope/dragonfire.git/'

Pushing to https://BenRoope@bitbucket.org/BenRoope/dragonfire.git
Completed with errors, see above.

Does anyone know how to fix this?