The aim of this paper was to determine the useability and functionality of a healthy lifestyles online educational resource for parents of preschool children. Five experts and 17 parents of preschool children participated in the evaluation. Participants were asked questions about the content and navigational aspects, the mediated forums and the innovative activities. Parents engaged in a focus-group discussion about these components. Participants suggested that the program was clear and consistent, the text font and colour easily read and the graphics aesthetically attractive; however, the technical language used throughout, some navigational aspects and the layout of pages needed to be modified. This is the first study to evaluate the useability and functionality of an online educational program for parents of preschool children and highlighted three critical components of the program that need to be modified prior to subsequent pilot and full-scale efficacy and effectiveness trials.