About the official TV app "MGA App for TV"

• Q.
  What is Android TV?
• Q.
  How do I download the TV app "MGA App for TV"?
• Q.
  I cannot log in to the TV app "MGA App for TV".
• Q.
  Can the TV app "MGA App for TV" be used on devices other than TVs?
• Q.
  Can I watch it on multiple TVs simultaneously?
• Q.
  Is it okay to log in to the TV app "MGA App for TV" using the same account as the official Mrs. GREEN APPLE app "MGA App"?
• Q.
  My child and I are both members; can we each log in using the same TV?
• Q.
  I can't find "MGA App for TV" even after searching the iPhone App Store. Is it not available for iPhones?