If you have issues please turn on the included debugger, just update the setting debug (approx line 257) from false to true. This will display all your setting on the agelock.php page, which should help you identify the problem.
If this doesn’t appear it maybe that your page can not find the location of the agelock.php file. Re-read ‘Step Three – Turn on AgeLock’ in the quick start guide as this is most likely where the issue will be. If you need more help with relative vs absolute links try the following links.