To update the information on your Landing Page, navigate to Organization, and select Landing Page from the dropdown menu. You will now see your Landing Page in "Edit Mode."
To edit the various pieces of your Landing Page, click on the blue pencil icons to open the edit screen associated with each section. Remember to click the Save button when you are finished editing each section!
To turn off "Edit Mode," click the Turn Edit Mode Off button at the top of the screen. This will show you what your Landing Page looks like to the public.
Below is a video that walks you through the process: