The first step with Tabajara are like with all the other Plone Products: download a release tarball, uncompress it inside your Products directory of your Plone instance and restart and after that, install it using the portal_quickinstaller too. Until here, nothing new :-)

The next step is define how do you want to categorize your content. To create an example, let's say that you want to categorize  your content using one dimension: subject. This way, open access your website root and click on portal_treegenerator tool. There, edit it with the taxonomy you want as the example bellow:

http://localhost:8200/Tabajara/portal_treegenerator/base_edit

1 About
1.1 The Company
1.2 Team
1.3 Board of Directors
2 Products
2.1 e-commerce
2.1.1 B2B
2.1.2 B2C
2.2 Groupware

After that, save and call on your browser URL the script.

http://localhost:8200/Tabajara/generate_taxonomy

It will generate the taxonomy for you. The taxonomy will be a set of TreeNode objects inside TreeNode objects making a tree. This taxonomy tree will be generated at /taxonomy, on your portal root.

It's done.

Now, try to add a document. You will see that your document can be categorized using Tabajara framework.