How to use Discuz! code

Discuz! code Effect
[b]Bold text Abc[/b] Bold text Abc
[i]Italics text Abc[/i] Italics text Abc
[u]underline text Abc[/u] underline text Abc
[color=red]Red[/color] Red
[size=3]font size is 3[/size] font size is 3
[font=Arial]font is Arial[/font] font is Arial
[align=Center]Center[/align]
Center