Greek and Latin prefixes are added to the *beginning* of words, not the end. They are called prefixes because they come *before* the root word.
Here are some examples:
* Tele (Greek for "far") + phone (Greek for "sound") = Telephone
* Sub (Latin for "under") + marine (Latin for "of the sea") = Submarine
* Pre (Latin for "before") + history (Greek for "story") = Prehistory
Suffixes are added to the *end* of words, and they can come from Greek or Latin as well. Here are some examples:
* ology (Greek for "study of") + bio (Greek for "life") = Biology
* ation (Latin for "action") + educ (Latin for "lead out") = Education
* ism (Greek for "doctrine") + capital (Latin for "head") = Capitalism
So, while many English words are formed from Greek or Latin prefixes and suffixes, the prefixes are added at the beginning, not the end.