Some of the higher end cameras (D7100 and up) have a limited ability to save settings, but otherwise, I'm afraid you cannot. In most instances the camera will stay with whatever settings you last used, but you can't, for example, save a set of settings for later re-entry.
This gets easier as you become more familiar with the camera, but for now you'll do best to keep the cards handy.
Comments
This gets easier as you become more familiar with the camera, but for now you'll do best to keep the cards handy.