How can you translate Spanish to English?

If you mean "what is the English Word for Spanish", then you already have the answer - it is "Spanish".

If you mean something more general, then it is a matter of years of study and practice to learn both languages. There are translation services you can find if you need a document translated, both on-line and in person.

Failing that, you could use one of the many online machine translators, but for anything beyond simple phrases, you can get absolute gibberish.