Within Teamwork Projects, you can add an announcement to your project which will display in the project's Overview area.
To add an announcement, go to the project's Settings tab.
Alternatively, you can access the settings via the project's Overview tab. Click the options (three dots) button in the top right and select Settings from the Jump To section of the dropdown.
In the Settings area, you will see an Announcement section where you can add your message to the text field. You can also enable/disable the announcement. Hover over one of the fields to reveal the edit pencil.
You can use markdown to format your announcement, for example to add headings or links.
Once you have added an announcement, when you hover over it (as long as you have the appropriate permissions) you'll also see an edit link to the far right of the announcement allowing you to update it from this screen.
For more information, see: Adding a project logo