Enable "Developer" inside the "Settings" app on iOS
The devices tab is now a new screen. Use for Development no longer exists.

The option in Window → Devices or ⇧⌘2. 

From that window you could enable devices for development by adding your provisioning profiles. Right click on device and select Show Provisioning Profiles.... It will appear a window where you can add your profiles.

After that you will be able to install your apps in that device.