can't push my files

$ git push -u origin master
error: src refspec master does not match any

Hard to say without knowing more, can I see the output of:

git status

I can think of a few scenerios, it could be you have uncommitted changes or you do not have your remote setup properly.

If you need to setup a remote it would look something like this

$ git remote add REMOTE_NAME REPOSITORY_URL
# a common example:
# git remote add origin git@github.com:USERNAME/REPOSITORY_NAME.git

If you need to commit its a matter of doing an add, commit, and push:

$ git add SPACE_SEPERATED_FILE_OR_DIRECTORY_PATHS
$ git commit -am "my commit message"
$ git push REPOSITORY REFSPEC
# a common example:
# git push origin master

I hope that helps, if not please post back the info so I have more to go off of.