By selecting the Menu Settings link (you can view this when you edit the page), you can toggle the Provide a menu link box and you'll be able to give the Menu link a title and select which menu you want the page to live in.
Read more about Adding a Page to the Menu
Your site comes with a rich-text editor which functions as any standard word processor might. The term "WYSIWYG" stands for "What you see is what you get" meaning that changes you make in the text editor area will appear as they would on the page itself. Read more about Overview of the Text Editor (WYSIWYG)
A hyperlink is a word, or a group of words, that will allow your use to click on them and jump to another page or document. This document will explain how you can add links to your content using the link tool within the text editor.
Read more about Adding Links (Hyperlinks)