There are a few ways to share Sagans with other Saganworks users, including sharing directly to their email addresses and embedding them into a webpage. While some methods require that other users have a Saganworks account, sending a Sagan URL link does not.
As of version 1.11, another way to share a Sagan (like in a social media post, for example) will be to link to the Sagan url. You can surface this url to one of your Sagans by clicking the Share button, turning on link sharing, then clicking 'Copy Link' next to the Sagan url.
Shared/Public Sagans are read-only, and not editable by those who view it.