The general notice type is your standard notice creator. You can add images and enter detailed notices to your community.
Check out the publishing a notice section of the help desk to learn more about creating a notice.
Add a new notice and name it.
Leave the notice type dropdown as 'General'.
Type your message in the body of your notice (You can include images if needed).
Select a Folder in the folder widget to the top right of the screen.
Hit 'Publish' on the right side of your screen to create and publish your new notice.