Download and install Semaphor on the device you want to add to your account. When you launch the program, you will have the option to sign into an existing Semaphor account using your username or email address, and the recovery key you set. Once you sign in, you will have access to your organizations and channels on this device as well.
If you have Semaphor installed on more than one device, you can add any devices from within your user profile. On the device you wish to add, choose "Sign into Semaphor", then click "Add This Device".
On the device where you already have Semaphor installed, open your User Settings by clicking on your Avatar, then click Devices. Under Devices, click "Add Device". This will display a Semaphoric code.
On the device you are adding to your account, scan the Semaphoric code. As soon as Semaphor registers the code, your device will automatically be added to your account.
If you do not have access to a camera on the device you are adding, you can use your Recovery Key instead. On the device you are adding, click "Sign in to Semaphor", then click "Use Recovery Key". On the next screen, type your username or email and the Recovery Key you had previously saved.