How far have you got with it? Have you got the application installed in your facebook page yet?
If not, install the app to your FB page:
The page must be a Business (Fan) page to which you have admin access. Make sure that you're logged in to the fan/business page (with admin privileges), then go to the app page that you linked to above, and click the 'Add to my Page' just below the Profile pic (a question mark) - a pop-up should then allow you to select the business page you want to add the app/tabs to.
To edit the page, click your 'Edit Page' link just below your page profile picture, and scroll down to the FBML app, and click the 'edit' link to bring up an edit box.
Give the box a title, and add your html code in to the FBML text area. Make sure that your max width of the overall collective elements doesn't exceed 520px.
Just add the html code that would normally be between the body tags (but not the body tags themselves).
It is safest to make all the styles for your html code inline styles, so that it doesn't rely on an external stylesheet, i.e. :
<div style="width:520px; border:solid 1px #333333; color:#FF0000;">Stuff Here</>
If you are linking to images, you would use absolute URL paths each time.
So, just make the code in Dreamweaver as normal, with inline css, and copy the code between the body tags and paste it in to the FBML box.
You can add more boxes as required. When you are done you can add the pages to your wall.
If that's not what you meant, apologies - perhaps you could explain a bit more?
My experience is not extensive, (I haven't added a form yet) but it seems to work fine.
Also there is much confused information about FBML's future in Facebook; Facebook says that it will be phasing out FBML in favour of iFrames on a canvas page - all a bit too ooer-missus for my liking, but I may look into it at some point. The benefits would be that you host the app developers SDK on your own (php) site - and the content code - which would presumably allow for dynamic content being displayed to the iFrame in your Facebook app. I'm not sure yet if I'm understanding this right (probably not, going by my recent standards) but that would be cool, as you could update your site content and facebook 'pages' simultaneously. Or not.
Actually, you can (at the moment) just add your styles to the beginning of your FBML before your HTML mark-up:
Your styles here
Your content html here