You can add collaborators by clicking the Share button: 

To add a collaborator, simply put in their email address, select their level of access (Owner/Editor/Viewer), and click Save.

Your collaborator will receive an email letting them know they've been added as collaborator, and the capsule will automatically be added to their dashboard.
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If your collaborator does not have a Code Ocean account, the notification email will invite them to create one.

Only one person can edit code at any given time. Multiple users can view it simultaneously. When someone is editing the capsule, all other collaborators will see it in read-only mode.
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To start editing, click the 'start editing' button at the top of the code pane.

When you're done, click the 'Finish editing' button.