You can use family manager account on several devices at the same time or change your devices.
Install Dr.Web Family Security on your device and enter the email and password you used when registering. If you forgot your password, tap Forgot Password? in the bottom of the screen (see What to do if I forgot my family manager account password?). Your license is bound to your account, so it will activate automatically. If this did not happen, you can restore your license manually (see How to restore a license if I reinstall Dr.Web Family Security?).
If a family member sends a request via push notification to the manager, all devices with active internet connection will receive it.