Setting is already there for the old mod to 3.6. Sould I edit it for 3.7.4 and how ?

EDIT: Found it. I placed $config['Misc']['debug'] = true; in the top of config.php - and the setting was under vbulletin options

I placed the $debug = '1'; in my config.php - but I dont see any changes in neither vbulletin options screen or phrase manager?

Where should I look for:

Now goto your vBulletin Options screen
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Create a new setting in the "Forum Display Options (forumdisplay)" screen.

Use the following information:

Varname - showthreadstartercolumn
Title - Show 'Thread Starter' column
Description - Turns the thread starter column on and off for forumdisplay.
Option Code - yesno
Default - 1
Display Order - *this setting should be automatically filled in by vBulletin - do not change it*
vBulletin Default - No