Built, not switched on yet. DocFila cannot post to Slack yet. The connector is built, but it needs an approved Slack app, which DocFila does not have.
The code is in place for a one-way notice in a channel when a document is signed, and for /docfila commands that reply with links. None of it runs until DocFila registers a Slack app. For now, share a document from DocFila as a link or a PDF and paste it into Slack.
There is no single Integrations screen. Cloud storage is in Settings › Cloud Sync and in a team workspace's Connectors tab. Slack, Gmail and Salesforce sign-in is in an organization's Settings. Accounting exports are in FinFlow › Reports. Outbound webhooks are an action in Tools › Workflows.
Keep going with the document workflow that matches this page. Open the tool you need, then finish the file in DocFila.