In order to connect your friendship lamp to the others in your group, you'll need a GroupID.
Then use the App setup guide: Friendship Lamps Setup Guide – LuvLink
To generate a GroupID, we recommend that you press the "Create a new Group" on the LuvLink app. This will automatically generate a GroupID for you and others who join your group.
With the App, you can enjoy all the features of changing colors, adjusting for time zones, lamp brightness and more.
If you already have the App, you can easily change your GroupID through the settings. App > Settings > GroupID.
Please make sure the GroupID is the same on all lamps.