The relevance of computational thinking (CT) in early education is globally recognized, with Uruguay already incorporating it into kindergarten curricula. However, there is a notable disconnect: existing CT tools, primarily devised for small home groups, fall short in larger classroom settings. To bridge this gap, we developed Robotito VPL – an innovative, free, open-source application tailored to teachers with no programming background. Robotito VPL enables teachers to guide young children in CT learning with Robotito, a robot that engages with its surroundings, supporting a playful, hands-on learning experience for children. This paper presents the results of two usability evaluations with seven teachers. We then translated the outcomes of these evaluations into valuable lessons learned and specific design requirements.