how to add members to chatter group, i can not find the names in manage members, i followed the given steps as it is

Hi @Sireesha Kuppala

- Make sure you are using the correct Trailhead Playground created directly from the challenge page. Sometimes we complete steps in a different org and the required users won’t appear. 

Next, go to Setup and check under Users that the required users exist and are marked as Active. 

Finally, open the Chatter Group, click Edit, and confirm the group is not Private. If it is, change it to Public and then try adding members again.