How can I type the Greek alphabet?
Here is a link to the Greek Discuss and Forum page. You'll find a way to change your keyboard so you can type either English or Greek (or many other languages). There are various ways to do it depending on your computer and all are easy to use. By typing two keys you change from one language to the other.
Check out the other information on these pages. There are many things to help learners.
And check out the Tips & Notes on the Lessons.