Removing a parent post from a class/community on Bloomz is currently a two step process. The first step is Flagging the post as inappropriate. You can do this by clicking on the three-dot menu located in the top right of the post and hitting the Flag As Inappropriate.
After you flag the post as inappropriate, you will get a notification. You can open the notification by clicking the bell icon located on the top right of your menu bar. After you click on the bell you will see a notification at the top of the screen saying that a post in your class has been flagged. At the bottom of the notification, click Remove Post From Group and it will be removed from your group.