The logo (and alternate logo) should be set in Appearance > Customize > General Settings panel. If, after setting your logo, it's still not visible on some pages, please do the following steps (note: example on Fast Food theme):
1. Navigate to the those pages' editor.
2. Locate Override Global Settings section at the bottom of the Page editor end remove Logo or Alternate logo:
For more info and detailed instructions please refer to our Online Theme Documentation.