The second screenshot is an older version of Noggit lol... Those buttons don't exist in Noggit SDL 1.2 (latest version).
If you would like to import models, you can either configure your Noggit with WoW Model Viewer or you can use the Imports.txt file in the Noggit folder directory, and paste the model filepath in there. Import options are in the Assist menu in Noggit. However, all of this information is abundantly available in the Noggit tutorials. Please use them before posting.