How to Put a Signature on a Jailbroken iPhone's Text

SMS Signature
1. Tap 'Cydia' on your iPhone and touch the 'Search' icon in the lower right corner of the screen.
2. Touch the search box on the top of the screen, type 'SMS Signature' using the on screen keyboard and then tap the 'SMS Signature' application.
3. Tap 'Install' in the top right corner of the screen and then tap 'Confirm' to install the application. The screen turns black with white writing as the application installs.
4. Touch 'Restart SpringBoard' on the bottom of the screen after the application finishes installing. The screen turns black, and then the lock screen appears.
5. Unlock your phone, tap 'Settings' and then 'SMS Signature.'
6. Touch the 'Off' button next to 'On/Off' to turn on the signature option.
7. Tap the area next to 'Signature Text' and enter your signature using the on-screen keyboard.
8. Press the Home button, which is the button below the screen with a square on it, to exit the 'SMS Signature' screen.
iRealSMS
9. Tap the 'Cydia' icon on your phone and then the 'Search' icon on the bottom of the screen.
10. Touch the search box at the top of the screen, type 'iRealSMS,' and then tap 'iRealSMS 3.0,' which is the latest version at the date of publication. Tap the entry with the highest version number if 'iRealSMS 3.0' is not available.
11. Tap 'Install' in the upper right corner and then 'Confirm.' The word 'Running' appears on the top of the screen as it is installed on your phone.
12. Touch 'Restart SpringBoard' on the bottom of the screen when the application finishes installing. Your screen turns black, and then the lock screen appears.
13. Unlock the phone and tap the 'iRealSMS' icon on your iPhone.
14. Touch 'Settings' in the lower right corner of the screen, and then touch 'Basic and UI.'
15. Tap 'Off' next to 'Use Signature' to turn on the text signature. The default text message signature, 'Sent from my iPhone,' is written below 'Use Signature.'
16. Touch 'Sent from my iPhone' to open the on screen keyboard, delete the default text and enter the new signature you want to use.
17. Press the Home button, which is the button with a square icon on it below the screen, to exit the iRealSMS settings menu.