You can left align text using the [left] tag. Rarely you actually need to use this, as most forums tend to tender text left aligned by default.

To find out more about the bbcode tags used on this page, please go to the bbcode tags reference page.

The following bbcode:

This is some text[left]This is some left aligned text[/left]

Yields this:

This is some text
This is some left aligned text