I'm presuming you're not on a Mac? because on a Mac it's dead easy, just click on the little flag in the menu bar (I hate the fact it's a union jack!) and go down to Character Palette Menu - all the accents you'd ever need in there

on a PC, according to <a href="http://desktoppub.about.com/cs/finetypography/ht/acute.htm">About</a>:

Under Windows hold down ALT while typing the appropriate number code on your numeric keypad to create characters with the acute accent marks.

For Windows, the number codes for the upper case letters are:
Á 0193
… 0201
Í 0205
Ó 0211
Ú 0218
Ý 0221

For Windows, the number codes for the lower case letters are:
á 0225
é 0233
í 0237
ó 0243
ú 0250
ý 0253

Cheers
Andy