Set up Personal Hotspot in iOS 9
on your hotspot
On your iPhone (or iPad with a mobile data connection), go to Settings > Mobile Data > Personal Hotspot and switch it on. You can connect using Wi-Fi (and the password shown here), Bluetooth or USB.
On your Mac, click the Wi-Fi icon in the menu bar. Your iPhone should be listed as an available network. Choose it, then enter the Wi-Fi password shown on your iOS device, then click Join.
You should now be able go online with your Mac just as you would when connected to regular Wi-Fi. Your iOS device’s status bar is now blue, and shows how many devices are using the hotspot.