By now you're probably well aware of the fact that vBulletin is very versatile, and in keeping with this, you won't be surprised to learn that there are several different ways you can customize a vBulletin installation. In fact, there are five different types of change you can make.
These are:
CSS stylesheets—CSS stands for Cascading Style Sheets, and it is a technology that enables web developers to decide how their web pages are displayed. This style information is stored in a stylesheet, which controls the way that things look on the final page outputted to the browser (and other devices such as printers).
Phrases—Nearly all the default text strings that are displayed by vBulletin are stored in the database as distinct phrases.
Templates—Templates control the layout and structure of almost every different page that vBulletin can show the end user.
PHP code—You can edit and add to the underlying PHP code of the vBulletin installation.
Hacks—Finally, you can modify...