This page exists within the Old ArtZone Wiki section of this site. Read the information presented on the linked page to better understand the significance of this fact.
Two buttons appear at the bottom of the Content tab. The plus button is the Add to Library button, which adds content to your folders. The minus button is the Remove from Library button, which deletes content from your content folders.
You can save an entire scene or you can save specific elements of your scene as a DAZ Studio preset script file. The steps are as follows:
Your saved preset will now appear in the Content tab in the folder you had selected during the save. You can navigate up or down the folder levels to find your new preset in the folders contained in the Content tab.