If you are new you may need to access the Greek keyboard in your computer. It's easy here are some links: Click here Another way is to use English characters for the Greek. It's in the same link. e.g. a=a ν=n ς=s. But the whole word should be either all Greek or all English letters.
Read the link and bookmark it for later. Also, be sure to read the Tips&Notes on each page top left. Lot's of information there. Please ask if you need any help.