Open the app, tap "Prepare For Jailbreak," and "Accept".
If the app expires (usually weekly), you must reinstall it using your computer. Steps to Jailbreak with Phoenix (Mac/PC): Download: Get the Phoenix 6 IPA file and Sideloadly. Phoenix Jailbreak
Choose "use provided offsets." If the device restarts and Cydia does not appear or crashes, open Phoenix again and tap "Kickstart Jailbreak". Open the app, tap "Prepare For Jailbreak," and "Accept"