- save your project ("Save" button above the code edit window)
- go to "My Project" on the left navigation panel
- select the project you want to share and click "share/embed"
- copy link for "Share code"
- Give the link to people you want to share you project with.
- People have to "Fork this" on the top panel, when they receive it, so they can work on their own version (fork) of the same project.
This way you can share you code without others being able to modify your version (but they can modify and save their version).
Is this what you're looking for?