From within your ePortfolio, click on "Portfolio Tools," in the upper right of the screen
Scroll down to "Permissions," and click on "Custom Permissions"
The permissions area is where you'll decide who gets to see or edit your ePortfolio. "Private to me," makes it only viewable to you unless additional permissions are added for select users, courses, or groups. "Private within Your School," makes your ePortfolio visible to everyone with access to Digication at your school, and "Public," makes your ePortfolio available to the world and searchable by Google. Simply select the access you feel most comfortable with (you can always edit it later), unless you've been given specific instructions to share your ePortfolio with a professor or course, in which case you'll want to click on "Custom Permissions."
Search for your course and select it from the search results drop-down
If you've been instructed by your professor to share your ePortfolio with a specific user, group, or course, this is where you're going to do so. Simply search for the individual or group and they will display in a drop-down where you can click on them and they'll be granted viewing access to the ePortfolio.