Linking pages internally
Highlight the text you want to link and click the link icon.
Type the name, or part of the name, into the Link field.
As you type you will be presented pages whose title matches your entry.
Select the page to which you want to link.
NOTE: [Optional] You can also enter in a title at the same time. This is hover text that displays when a mouse hovers over the link.
Click Save and you are done!