How do I type the lü for Character Romanization? I am studying classical Chinese and when I try to type in any words that require the ü it just randomly chooses a character.

How do I use the Traditional pinyin entry method on a Mac and get the the ü?

Thanks.
The OP is asking how to type characters, using a pinyin IME, when those characters have a ü in their pinyin spelling. For example, how do you type 绿=lü? This is different than asking how to actually type the letter ü. The answer is to type a v. To follow the example, change to the pinyin IME, type lv and select 绿.