Go to your settings on your phone.
Click on personal hotspot.
Turn on the hotspot (up top) This will make it discoverable as a wifi source. You can change the password to make it easier.
On your other device, it should show up in your wifi with the phone's name and double chain link icon. Select it.
Add the password and hit join. That's it! If you have any problems, check with your provider to be sure you have this feature in your plan. Also, remember that this will use your data. Enjoy!