the pinyin of 你好　is "ni hao" but if you were to spell it out using english it would look more like "knee how" haha, yea.. sounds funny.

How can we show you pronunciation here? Find an online talking dictionary. That should help.

ni2 hao3.. Ive no idea how to show u the pronunciation.. do u use skype or any other apps to chat?

If you want help with Mandarin pronunciation, one of the best resources I know of is free. It is the 6 pronunciation lessons which are part of the Foreign Service Institute Chinese course. This was used to teach U.S. diplomats who would be working in China. You can listen to / download them here: http://www.fsi-language-courses.org/Content.php?page=Chinese For the "Resource Module", get the "Text" and also the "Pronunciation and Romanization" audio, Tape1 - Tape6. These provide excellent teaching of how to pronounce pinyin. HTH

relax your tongue and try to elevate your tone . Let others feel they are pleased with your greeting.