How to type vertical line on macbook pro keyboards?

(1) It sounds like you might be using a Spanish keyboard. You should specify this to begin with. Unless you do, the default assumption is that you're using a US keyboard. The advice you received is correct for the US keyboard.

(2) To see how to enter any character available with your current keyboard, enable Keyboard Viewer, as described here

<http://docs.info.apple.com/article.html?path=Mac/10.7/en/mh35878.html>

(3) There is no "alt" key on a Mac keyboard. You are talking about the Option (⌥) key. See (search for "Alt key" in)

What's it called on my Mac?

<http://docs.info.apple.com/article.html?path=Mac/10.7/en/cpmh0038.html>

Switch 101: On Windows, I used to...

<http://support.apple.com/kb/HT2514>

(4) My advice is move on from Fraise. AFAIK, it's dead. Try TextWrangler, which is free and more capable.

If you mean | which is on the keyboard as \|

it is shift hit the key

in what program?

Hold the shift key while pressing the key with a backslash & vertical slash:

|

\