help with displayed pic sizes

[rm5211]

i am new to both virtuemart and joomla so please be patient.  i have a site which displays my products in a 3 x 3 format and i would like to increase the pic size. the location is listed as "mod_virtuemart_featureprod" in the joomla module manager.  i have looked and can not seem to find where to change the size of the pics.  i assume that it is done inside virtuemart since that is where the product info is.  can someone please guide me to a solution?

thanks

bob