First you need to find the apps you want to add and install them. I use one for my blog, my TpT store and my top fans.
For the blog: NetworkedBlogs
For the stores: Add Page Tab
To create promotions and giveaways (Paid): Easypromos
For the fans: Fan of the week and Topfan
Ok, with the tabs installed, now you need to design an image for the tab. It must be 111x74 pixels. You can download and use these for free:
Also, you can ask me for custom images for your facebook fanpage.
Now, go to your page, and:
Search for the image you want to insert.
... aaaaaand ......