Using GreyBox
Check out the Testing GreyBox integrator post on my demoblog for examples displaying windows with GreyBox Integrator.
Using the Quicktags Button
You can insert the code for GreyBox using the quicktags button. The quicktags button is available under the HTML tab in the compose screen for new posts and pages.
Hit the GBI button in the quicktags toolbar. Using this button is very similar to using any of the “link” button in the toolbar, but ofcourse with several more options.

The above screenshot is self explanatory. Choose an option as per your requirements. From my experience 1 and 2 will be one of the most used options.
Choosing any of these options will allow you to enter the URL of the plugin / page you wish to display.

If you chose to insert an imageset or pageset, you will be prompted to enter its name.
If you chose to insert a page, then you also get the option of entering the width and height of the same.
Entering GreyBox Code manually
The GreyBox documentation in detail covers this topic.
Check out the Normal Usage and Advanced Usage instructions.

