The article examined how adults with cerebral palsy and spinal cord injuries used the self-management app iMHere 2.0, focusing on accessibility barriers related to fine-motor impairments. Through qualitative testing and interviews, researchers found that the original app design posed significant usability challenges, but introducing customizable features—such as adjustable font sizes, larger buttons, high-contrast displays, and edge-aligned controls—dramatically improved performance and satisfaction. The study underscores the importance of participatory, user-centered design in digital health, showing that accessibility is not a secondary feature but a critical element for equity and inclusion in mobile health technologies.