Every project has a Discussions tab under the header section:

Click on that tab to see all the discussions about your product.

To post a comment, you need to sign in first. And then all you need to do is write them into the comments box when signed in and hit “Comment” when you’re done:

You can add formatting to your comments, like bold, italics, and underline, as well as add links and more.

You can also tag other Prelaunch users in your comments. This is especially useful if you’re replying to someone else. In order to reply, just find the comment you’d like to reply to and click “Reply” underneath the comment:

Don’t worry if you make any mistakes, you can always come back and edit it over the next few days!