Hi,
The “Share” button is supposed to be on the top right of the Workflow editor.
If you don’t see this button it is most likely because you are running an old n8n version on your cloud instance (before the feature was introduced).
Can you let me know which version you are running? You can find this information on the bottom right of the Settings menu. If you are running a version below 209
you will need to upgrade your instance.