In order to enable Slack integration, you need to be either a Leadfeeder Premium or Trial user. Also, before starting to initiate the integration, please make sure that you have Admin privileges for the Slack workspace you want to connect with Leadfeeder.
How do I connect Slack with Leadfeeder?
STEP 3: Next, select Account, then Overview under Integrations and finally choose Slack.
STEP 4: On the next view, click on Add to Slack.
STEP 5: In the next step you are asked to Authorize the app.
Once you've authorized the app, the integration initiation will start loading. When that is done, you need to select which public channel you would to use as a default Slack channel to send single leads.
STEP 6: Click on Save and continue to Leadfeeder.
STEP 7: Check this article to learn what you and your teammates can do with the integration.