Once Slife is installed, a default webhook to Slack is already set up.
Go to Dashboard / Slife / Webhooks and click on the default webhook.
The only thing that needs to be changed is the URL. To get an URL, go to https://slack.com/apps/new/A0F7XDUAZ-incoming-webhooks, create a webhook and copy and save the URL.
Slife is now able to send messages to Slack. To test it out, click on the "Test connection" button.
Alternatively, you could click on "Apps & integrations" and search for "Incoming webhook".
Do you want to use Slife in your own code? Go to the developers section to find out how.