Hi Francisco,
You cannot map to the newly created fields. Instead, Use the Visual Ribbon editor tool and create a new button with the same Name as "Qualify".
Then Follow the below link. This may be useful for you,
http://gtcrm.wordpress.com/2012/04/03/building-custom-screens-using-dialogs-and-ribbon-buttons-in-crm-2011/
You can create your own dialog and map the fields you needed.
You can create a new Dialog based on the above link and that Dialog Guid need to be provided in the JScript code.
Also you can download the Ribbon Editor tool from this link:
http://crmvisualribbonedit.codeplex.com/
Once if you call the function inside the Button You created, Webpage Dialog will be opened and and you can select your appropriate Condition.
Naren