What is FBML? It stands for Facebook Markup Language. Read about it directly from the source: http://developers.facebook.com/docs/reference/fbml/
After some digging, I found a link that actual works for adding the Static FB app to your page. Clicking this link will take you to the app.
Step 1. Clicking the link above will take you to this page where you can install the app.
Step 2. Select which page that you want to create the static page on. If you manage multiple pages, you will have to install Static FBML on each page.
Step 3. Now go to your home page and you will see the link to the Static FBML page in the left sidebar.
Step 4. Click on the “Edit Page” button in the upper right corner of the screen.
Step 5. On the edit page, click on the “Apps” link in the left sidebar.
Step 6. Most likely near the bottom of the page, you will find the app for Static FBML. Click on the “Go to App” link.
Step 7. Give your page a name and add your code here. The best practice seems to be adding an image to this page with some FBML to add functionality. That will be covered in the next tutorial.
Step 8. The default for this static page is for it to appear in the sidebar, if you do not want to have the link to the page appear while you are constructing the static page, then return to the Apps management page and under the app, click on “Edit Settings”. Then simply click in the pop-up that appears to change the status of the tab/page. “Available” means that there is not tab shown. “Added” means that the tab is showing.
Now click on your home page and you will see the link to the static page in the left sidebar with the name of the page that you set in step 7.
The next part of this tutorial will show you how to customize this page and set it as the landing page for your Facebook page.
Here is the Static FBML Tutorial from above in video form:
Here’s another tutorial that covers the same information. Link