It is known that we need to resign yalu102 every 7 days generally, as cydia extender released, we don't have to resign on computer. It makes it available to complete resigning on our devices. Please read the following steps carefully.

Operations: 

Step 1. Add this repo (https://apt.enduniverse.com/cydia/)

Step 2. Install cydia extender, Installer, Mterminal and Filza file manager.

Step 3. Open Filza and locate: /var/containers/bundle/Application/yalu102.app

Step 4. Scroll down and find "embedded.mobileprovision" and open it with text editor.

Step 5. Find <key>com.apple.developer.team~, and copy the code between "string", they has been circled around.

Step 6. Open Mterminal and write “su”, then press "enter" to write you root password. If you have not changed your root password, the password is: alpine and then press "enter".

Step 7. Once you have accessed root write Cyextender urcode. Example: cyextender 1234567890( 10 codes you just copied). And then hit "enter", you will see a bunch of packages have been installed manually through Mterminal.  When you go back to the home screen, you will see a new application called "Extender".

Step 8. Reboot your device. Open Extender, a notification will pop up: "Extender" Would Like to Add VPN Configurations, and then click "Allow". Then close Extender and reopen it, click "Download" ->"Revoke Certificates" and then enter your Apple ID account and passcode to revoke.

Step 9. Install the "Cydia Extender" profile. ( Settings -> General -> Profile & Device Management)

Step 10. Go to Luca’s website: https://yalu.qwertyoruiop.com/ on Safari, then download ipa and open it in "Extender".  And enter your Apple ID account and password to install yalu102. 

And it is done. Enjoy the jailbreak now.