the home page is where all of your updates will appear, with the most recent updates at the top. each user's home page is different, since all updates are specifically sent to you by people you know. to see the full update inside, simply click on the preview. to see a contact's page, click on their name on any screen.
from the update's main page, you can scroll through all of the pictures that were shared with you, and read the entire content. to respond, scroll to the bottom and click reply. this is part of the magic of immi: the response will be a direct message to the person that shared the update with you. nobody else will see your response.
should you ever need to report an update, click on the 3 dots in the top right corner