If you go the main site where you purchase zen you will see a banner or similar advertising stating this. Click on it and it will take you to another site whereby you have to choose a company and complete whatever questionnaire, etc... they have. Once completed you get the zen, although, it may not be instantaneous. Having never done it myself, I cant tell you more. Part of my reason for refusing to do so is because sometimes they require personal information (i.e. name and address, etc...) which later translates into spam coming to you for crap you don't need or want.
That being said however, there are a variety of ways of getting Free Zen. The best way imo is to purchase a lifetime membership! You get a stipend (400 or 500) per month afterwards for life!
"The world ain't all sunshine and rainbows. It's a very mean and nasty place and I don't care how tough you are it will beat you to your knees and keep you there permanently if you let it. You, me, or nobody is gonna hit as hard as life. But it ain't about how hard ya hit. It's about how hard you can get hit and keep moving forward." - Rocky Balboa (2006)
...that works for holodeck-zen. for tribble-zen i guess u already have to had bought something in z-store. when you then transfer your char to tribble you still will have all ships and such, but also the complete ammount of zen you purchased for holodeck . hope i'm not wrong, worked for me.
Klink: House of Beautiful - J'Luc/Rom: Lag Industries - D'Waste/Fed-Sci: Lag Industries - IAM
Join Date Hoster: Dec 2011 - Join Date Symbiont: 1403 A.D. and not a dull moment
PvP improvements, since 2010 lol/50+ Fleet-, Lobi- and Lockboxships=unreclaimable trash