I've seen a question on how to add a photo to your post. I'll try and make this as simple as I can, and you may ask questions or correct me as you see fit.
when writing a post to a thread, some tools may come handy to you.
most of them will be above the text window itself. those are the text tools, the advanced tools and the smilies. (those are not their official names, It's just how I perceive this)
The text tools:divided into 5 sections, the text tools consist of
a. bold, italicize, underline, strikethrough
b. glow, shadow, marquee
c. preformated text, left align, centered, right align
d. horizontal rule
e. font size, font face, change color
*
boldsign:

action: makes the selected text bold
example: (not bold)
(bold)[b]text[/b]
*
italicizesign:

action: makes the selected text italicize
example: (not italic)
(italic)[i]text[/i]
*
underlinesign:

action: underlines the selected text
example: (not underlined)
(underlined)[u]text[/u]
*
strikethroughsign:

action: the selected text is striked-out
example: (no strike)
(strike)[s]text[/s]
*
glowsign:

action: selected text has a glow
example: (no glow)
(glow)[glow=red,2,300]text[/glow]
note: can change glow color and size by changing the parameters after the "glow=".
*
shadowsign:

action: selected text has a shadow
example: (no shadow) (
with shadow) <- for some reason this does not work for me...
[shadow=red,left]text[/shadow]
note: can change glow color and direction of the shadow by changing the parameters after the "shadow=".
more to come.