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1.  Bold =  [b ] and  [/b ] (without space)

2.  Italic  =  [i ] and  [/i ] (without space)

3.   Underline =  [u ] and  [/u ] (without space)

4.  strikethrough = [s ] and  [/s ] (without space)

5.  highlighted =  [highlight ] and [/highlight ] (without space)

6. Black =   and [/color ] (without space)

7. Link -  http://facebook.com = [url ] and [/url ] (without space)

8. insert image  

code =  [img ] image url [/img ](without space)

9. insert Youtube video

code = [youtube ]  Youtube code [/youtube ] (without space)
Youtube code = Copy and paste the short code coming after "v=", before the "&" symbol
eg: //www.youtube.com/watch?v= lu1qtUhkh5s &feature=related