Step 1: you visit http://taig.com/en/ to download the latest TaiG tool and extract out the Desktop. Click Download TaiG Jailbreak Tool for download.
Step 2: Your computer has to install itunes and itunes receives iPhone, iPad.
Step 3: Turn off Find My Phone, to Setting-> iCloud -> Find My Phone -> select OFF (if you do not log in iCloud, you can ignore this step)
Step 4: Turn off Passcode, in Settings -> Touch ID & Passcode to off. ( if you don’t set passcode, you also ignore this step)
Step 5: if devices running are FW 8.1.3, 8.2 or 8.3, 8.4, you should earse all contents and settings before starting. In Setting-> General-> Reset-> Erase All Content and Settings (back up your data before doing so) or Restore 8.4 by iTunes.
Step 6: Turn on flight mode
Step 7: Right click on TaiG and select Run as Administrator TaiG
Step 8: Connect your iPhone with TaiG and uncheck at text 3K Assistant and then click on Start to begin the jailbreak.
Step 9: When tools run to about 12% or 13%, iPhone will reboot. After the iPhone reboots, iTunes will automatically turn on and connect to the iPhone, then you should immediately turn off itunes.
Step 10: After rebooting, tools will continue to run the jailbreak process. After finishing, TaiG will announce that Jailbreak Succeeded and appear the smiley face.
Step 11: iPhone will restart, Home screen will have Cydia iCon.