The integration with Slack allows you to receive notifications directly in your Slack channels. You decide yourself which projects in Forecast and which channels in Slack should be connected.
Step 1: Go to the Slack integration, click here.
Step 2: Click the Add to Slack button
Step 3: Click Authorize in the new window
The integration is now active.
Step 4: In Forecast, go to the project(s) you wish to receive notifications from through Slack
Step 5: Go to Project Settings
Step 6: Scroll to the Apps & Integrations section, and look for Slack
Step 7: Select the Slack channel in which you wish to receive the notifications for this project