Superb translations but Yosemite -iMAC has issues

Translations work when typing directly into the source. Pasting an email message in Spanish did not work. Am I missing a menu bar-How To—the Website Support needs an FAQ.
I could not find the Save function. Each translation typed in copied and pasted into another app required deleting the source and target to translate another message.
I must be missing part of the software??? I must say what I do get translated is a comprehensive success.

a jerome about iTranslate - Translator