The document introduces the Cross-Border Citizen Scientists project, which aimed to provide science education to young people on both sides of the Finnish-Russian border. The project involved 12 students from Finland and Russia who studied the border area through four themes: environment, history, business, and mental borders. For each theme, students attended lectures, participated in in-depth study periods with specialists, held joint seminars to present findings, and taught other students what they learned. The goal was for the young "citizen scientists" to gain first-hand knowledge of the opportunities and challenges of the border area through conducting their own small research projects. The manual provides details on implementing a similar cross-border youth education project in other border regions.