The activity feed is that forum where you and your invited users can interact regularly. This interaction gives you access to first-hand feedback from your team/clients. Here you and your users can post comments as well as keep track of what new has happened.

For opening activity feed of the project, first go to the project page, then click on this icon for toggling the activity feed.

When creating a post or message, you have the flexibility to enhance it by attaching files, images, emojis, and tags. 

Furthermore, you have control over the visibility of your post. You can choose to make it visible to everyone or limit it to just yourself. Additionally, you can create a custom audience by selecting specific users to view your post. This allows you to save the audience for future reference.

To take control of your post, simply click on the three dots. From there, you will be presented with various options to edit your post, copy its link, or delete it entirely.