I try to install PHPQuickProfiler. In my "vendor" folder I now have folder "pqp" whith all the downloaded data. Also I have activated 'profiling' in config.php and db.php.
Under my site I can also see the Link for PQP, but clicking is not possible.
p.s. if you look at the source code, the function openProfiler is absolutely defined, which is another clue there's something going on with the rest of the javascript you include...
The profiler code is as simple as can be: it defines an onClick on the link which calls the javascript function openProfiler() which is defined just above that.
If you get a message saying the function is not defined, the most obvious reason is that you have an error in your javascript somewhere, that halts further processing, and thus causes the function to be undefined.