How do I type the lü for Character Romanization?
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.