(For IOS and some Android) To find the pinned post where all the latest news and happenings (such as prompts etc) go to the main page on your app for the group and you will see about mid way down towards the middle a push pin and next to it will say View Pinned Post
Click that and then this screen will come up. You will want to click the light gray Continue Reading. .. To view the whole post so click that link to take you to the post.
Once there it will look like this. Just scroll down to read the whole post. Dont forget to check out the comments for the latest updates and to like the post to get notifications.
I do not recommend click on the photo. If you do it will bring you to this screen. Problem is when you click See More right below it to read the post that goes with it, it does NOT show the whole post. So I recommend clicking the Continue Reading link instead.