If you are using Google, click on insert, then go to symbols and type the symbol you need to add.
If you are using Microsoft, go to insert, then go to symbols on the right of your screen. Go to more symbols, where you will have to locate the symbol to be inserted. Make sure your font is set to normal text and your subset is set to Latin 1- supplement. If all else fails, copy & paste from above!!!
If you have a desktop computer, try using the following shortcuts:
Hold down ALT + 160 = á
130 = é
161 = í
162 = ó
163 = ú
129 = ü
164 = ñ
168 = ¿
173 = ¡