An author can publish a Module or Wizard simply by clicking the Publish link just under the Module/Wizard title as shown in the example below.
More Information Link
Click on the What's this link for more information on this process
Clicking “What’s This?” displays text (shown below) describing the effect of publishing a module.
"Publishing a module moves it from development to being ready for use by learners. Once a module is published, users's results will be recorded, but the author can no longer add, remove, or change interactions. You cannot undo this action."