General Settings 
Use the vBulletin Options > vBulletin Options > General Settings setting group to control several general aspects of your board.

This ranges from meta tags to the use of forumjump, enabling access masks to the display of IM icons.When you are done, click the [Save] button to apply the changes.
Jose Amaral Rego 04th May 2008, 11:29pm
Seems that you are missing this for 3.6.8 PL2

Disable AJAX Features
AJAX uses JavaScript and features of recent browsers to allow additional data to be retrieved without doing a page refresh, such as posting with quick reply or editing a thread title inline.

These features may cause problems with boards not running in English. You may use this setting to disable all AJAX features or just the ones problematic with non-English boards.
Jose Amaral Rego 04th May 2008, 11:29pm
Show Instant Messaging Program Icons
Setting this option to yes will show the images for ICQ, AIM, MSN, and Yahoo! Messenger if the user has entered the correct information in his/her profile. These links are shown in various places through out the forum, on posts, who's online, memberlist, profile, etc. When set to no the information will be displayed in their profile in the form of text.

This is only shown in vBulletin Options > vBulletin Options > Style & Language Settings