different writing

I know how to do the color post but not the other different ones like bold,font,italic,etc
So can somebody tell me how to

 

thanks

 

I actually want to know it so if u know legit than pls tell me......

 

Ugh this is confusing

testing

 

How u do bold ?

 

[text=bold]ummmmm[/text]

 

[/b]pls work[/b]

 

Testing

 

italics

 

underline[/]

 

underline

 

I'm a fast learner by my self lol

 

[17]big words[/font]

 

can someone teach me how to do the size of the words