We are getting lots of questions on creative commons and how to add it to our work. This is well worth reposting.
Licensing a work is as simple as selecting which of the six licenses best meets your goals, and then marking your work in some way so that others know that you have chosen to release the work under the terms of that license.
Here is an infographic (loehrich) that walks you through licencing your work using Creative Commons.
Using the licence search tool will also help you find the right licence.
Here is my podcast (loehrich) on Creative Commons.
Hopefully you will find this helpful.