By default, any private capsule you are working on will have a 'Submit for publication' button at the top of its timeline.
This button won't be visible, however, if you have uncommitted changes to commit, or if your last run was a Cloud Workstation rather than a Reproducible Run.
Please commit any and all changes and run one final 'Reproducible Run' to reenable publishing.
Note: if you are a collaborator, please ask the original author to publish, or duplicate the capsule, run once, and press 'Submit for publication'.