Media Wiki:Adding A New Page

go to the page where you wish to add the new link (for example click on Mediawiki).
click edit and add the name of the new page between doubled square brackets, for example say I wanted to make a new page on a Paypal extension I made I would add the following content to the page: [[Paypal_Extension|PayPal Extension]]
when you save the page you will see that the link is red colored.
click on the link, you will be transfered to an empty page where you can start to write the article (in our example the article name would be PayPal Extension)