Having had a quick look I think you are in for a hard time.
jEditable looks really neat, but its a plugin for jQuery. The samples are built with as you point out dependencies on other classes to manage database access etc.
If you don't already know this jQuery package, you should first become very familiar with it. My advice is to write some simple test stuff using jQuery before launching off trying to hack around other plugins. Make sure you get into your head how Ajax works.
If you are totally sold on jQuery then get comfortable using that package, and I am sure you will work out how to write your own application that does pretty much what jEditable does.
If you are after an "editinplace" as it is sometimes termed then try this search
If you are determined to see this through with jEditable then you likely need to edit the dns here:
$dsn = array(
'phptype' => 'sqlite',
'database' => '/tmp/editable.db',
'mode' => '0666'
So you should head off for the user manual for that PEAR package, and change those settings to suit.
I am not familiar with it.