Forecast lets you keep details on your clients, and also give access to the system if you so desire. This makes you able to invite your client onboard and collaborate on your projects together.
Don't worry, your client will only get a limited view as a Client User.
Step 1: Navigate to the project you want to add a Client User
Step 2: Go to the Client tab in the left side menu
Step 3: Make sure you have selected the right client through the dropdown at the top right
Step 4: Scroll down to All Client Users
Step 5: Click Add Client User
Step 6: Fill out the form with name, email, phone, and select whether the person should have access to the Forecast project.
If you selected to give access to the project, the new Client User should now receive an invitation on the email you specified.