There are a few ways to make a community post on YouTube on an iPhone. One way is to use the YouTube app on your phone. Another way is to use the Google+ app. You can also make a community post on YouTube by using the following steps:

  1. Open the YouTube app and sign in with your account.
  2. Type in a few words about what you want to share and click the share button.
  3. Type in a link to your video and click the share button again.
  4. Click on the save button to create a new post and share it with your friends!