Where's the CubiTag button? How to press CubiTag correctly?
Before you press your CubiTag, make sure you've put the battery inside. Learn more on how to put the battery here
On the latest CubiTag, the CubiTag will make a beep sound when you press it correctly. On the previous CubiTag, it won't make a beep sound. So, to know if you press correctly or not, try to add your CubiTag to your phone. If it's not successful, try to restart your phone's Bluetooth connection, and then try to add CubiTag again. After that, you should be able to add your CubiTag successfully.