How to use this dictionary

Which word to look up?

With electronic dictionaries such as this one, the which question is slightly easier than with traditional paper dictionaries. Generally:

you can look up a word as it appears on the page, even if it is plural, a conjugated verb form etc;
very occasionally, you might find it helps if you can look up the basic form of a word (e.g. a singular instead of plural);
the Spanish-English dictionary currently contains a spellchecker specifically designed with non-native speakers in mind.