New Listing Under 'Minimum Values'

[thinixstore]

I needed to add a CVV2 field for the credit card information on my oscommerce site. I was able to figure that out easily; however, I have been unable to find out where I need to go to create a 'Minimum Value' so the appropriate message pops up if the client does not fill it out. Right now, the box pops up with the code for the section rather than an actual quantity; obviously, I need this to read '3'. Where do I need to go, or what do I need to change to make this work properly? It has been awhile since I have made these kinds of edits on the store, so I don't quite remember everything. I was thinking I needed to access the section in 'phpMyAdmin' but I have been unable to locate the affiliated source. Can someone please help me so clients don't see the code, as that looks really tacky? I want to thank anyone who helps me in advance.