Click the blue download button.
http://www.taig.com/tutorial.html translation:
"
Verify that your system is iOS 8 - 8.1.1
Method to check the System Version
Settings → General → About
Note: If you have OTA upgraded, the jailbreak may fail.
Please download the latest system firmware and then attempt to jailbreak.
Click here for system upgrades and jailbreak tutorial.
Please back up your important data before the jailbreak
Please use iTunes to back up important data
This avoids unnecessary data loss.
Disable your lock screen password, and "Find My iPhone" feature.
Please disable the lock screen password, and "Find My iPhone" feature, then perform the jailbreak. Otherwise it will cause the jailbreak to fail.
1. To turn off the lock screen password: Settings → Password → Turn off password
2. Disable "Find My iPhone": Settings → iCloud → Find My iPhone → Click to disable"