LinkedIn publishing runs through Zernio, our publishing partner.
Go to Settings → Connected apps.
Find the LinkedIn card and click Connect.
You'll be redirected to LinkedIn to authorise the connection, then back to Curatebase.
Once connected, the card shows your LinkedIn profile name and a green status. You can now publish or schedule posts directly from the Compose screen or from any Library remix.
To disconnect, click Disconnect on the same card. Scheduled posts will fail to publish until you reconnect.