Intervention and control group participants were invited to the Endocrinology and Metabolic Diseases Outpatient Clinic for a pre-test. n addition, each group was given insulin injection practice training using an insulin injection model. Whether the application was correct, incomplete, or incorrect was recorded on the observation form by the diabetes nurse. The web-based "Insulin Guide" mobile application prepared by the researcher was installed on the phones of the intervention group participants. They were asked to use this application for three months, at least three hours a week. Participants were followed up through the application. Participants who did not use the application were informed by SMS or phone and asked to use the application. Participants who did not use the application were excluded from the study. No intervention was made for the control group participants. At the end of three months, the participants in the intervention and control groups were invited to the Endocrinology and Metabolic Diseases Outpatient Clinic for a post-test. Both groups were asked to practice again on the insulin injection model. Whether the application was correct, incomplete, or incorrect was recorded on the observation form by the diabetes nurse.
