Welcome
. If you look at the lower-right area of everyone's posts, you should see a Quote button. Click that, and it will automatically take you to the Reply to Topic page with the quote all set up in your reply. You can quote someone manually, like this (I've misspelled QUOTE in the example so that you can see what it looks like before it gets translated by the forums):
[QUTE=alanbuilds](Excuse my sounding like an idiot,but . . . )[/QUTE]
That's all the Quote button does; it automatically adds those tags in (spelled correctly though) at the beginning of your post, with the text of the person you're quoting in between the tags.
For bold, italic, etc., there are little buttons above the text field where you type your text in the reply page (i.e. what I'm looking at as I type this reply right now). Or some people (like me) just like to type in the tags directly. It's like HTML except it uses brackets instead of < and > for tags. The letter B enclosed in brackets (so [ B ] without the spaces) turns bold on, then you type the stuff you want in bold, then type [/b] to turn it off again. Anything within those matching B tags is displayed as bold. Same for italics (I tags) and underline (U tags).
And to the right of where you type your text are all the smileys. If you click a smiley, it just inserts the character combination that makes the smiley, like a semicolon followed by a close-parenthesis turns into a winking smiley, for example.
Hope that helps!