There are a few ways to join group chat on Instagram. The first way is to open the app and sign in with your Instagram account. Then, open the group chat and type in the name of the group you want to join. The second way is to use the Group Menu on your phone. When you tap on the Group Menu, you will see a list of all of the groups that are currently active on Instagram. Type in the name of the group and hit enter. The third way is to use one of theinstagram apps that comes with a group chat feature. For example, if you are using Instagram for Android, then you can join a group by tapping on its icon in your app’s main menu and selecting “Join Group” from the menu item.