If Spy Lantern Keylogger is visible you have to click on Uninstall shortcut
within Windows Start Menu:
Start > Programs > Spy Lantern Keylogger > Uninstall
or find Spy Lantern Keylogger uninstall record within Add/Remove Programs:
Start > Settings > Control Panel > Add/Remove Programs > Spy Lantern Keylogger
If Spy Lantern Keylogger is invisible you have to run Spy Lantern Keylogger Control Center by pressing program hotkey (default hotkey is Ctrl+Alt+Shift+L). You will get following window then:

Click on File menu and choose Uninstall to uninstall program. You have to reboot computer to finish uninstall process. It's obligatory condition.