Wi-Fi
On the device that you want to connect to, go to Settings > Cellular > Personal Hotspot or Settings > Personal Hotspot and make sure that it's on. Then verify the Wi-Fi password and name of the phone. Stay on this screen until you’ve connected your other device to the Wi-Fi network.
On the device that you want to connect, go to Settings > Wi-Fi and look for your iPhone or iPad in the list. Then tap the Wi-Fi network to join. If asked, enter the password for your Personal Hotspot.
Bluetooth
To make sure that your iPhone or iPad is discoverable, go to Settings > Bluetooth and stay on that screen. Then on your Mac or PC, follow the manufacturer directions to set up a Bluetooth network connection. Learn more about using Personal Hotspot with Bluetooth.
Personal Hotspot supports Bluetooth connections with Mac, PC, and other third-party devices. To connect another iOS device, use Wi-Fi.
USB
Make sure that you have the latest version of iTunes on your Mac or PC. Then connect your iPhone or iPad to your computer with the USB cable that came with your device. If you see an alert that says tap "Trust This Computer?" tap Trust.
Set or change your Wi-Fi password
You need to set a Wi-Fi password in order to set up a Personal Hotspot. To change the Wi-Fi password, go to Settings > Cellular > Personal Hotspot or Settings > Personal Hotspot, then tap the Wi-Fi password.*
Choose a Wi-Fi password that's at least eight characters long and use ASCII characters. If you use non-ASCII characters, other devices will be unable to join your Personal Hotspot. Non-ASCII characters include characters in Japanese, Russian, Chinese, and other languages. ASCII characters include:
All the letters in English, both lowercase and uppercase
The digits 0 through 9
Some punctuation marks
* When you change your password, any connected devices will be disconnected.