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. At the end of three months, the participants in the intervention 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.

Control group participants were invited to the Endocrinology and Metabolic Diseases Polyclinic for the pre-test. They were asked to administer insulin injections using an insulin injection model. Whether the application was correct, incomplete or incorrect was recorded in the observation form by the diabetes nurse. No intervention was made to the participants. At the end of three months, the participants in the control group were invited to the Endocrinology and Metabolic Diseases Polyclinic for the final test. And they were asked to repeat the insulin injection model. Whether the application was correct, incomplete or incorrect was recorded in the observation form by the diabetes nurse.

Health Belief Model-Based Mobile Online Training

The metabolic variables (Body Mass Index) of the individuals in the experimental and control groups were taken from hospital records and evaluated. With the developed web-based mobile "Insulin Guide" application, the experimental group was trained for three months. No intervention was made in the control group. Three months later, the BMI values of individuals in both the experimental and control groups were re-evaluated from the hospital records.

The metabolic variables (Fasting Blood Sugar) of the individuals in the experimental and control groups were evaluated by taking them from the hospital records. With the developed web-based mobile "Insulin Guide" application, the experimental group was trained for three months. No intervention was made in the control group. Three months later, the FBC values of individuals in both the experimental and control groups were re-evaluated from the hospital records.

The metabolic variables (High Density Lipoprotein) of the individuals in the experimental and control groups were evaluated from hospital records. With the developed web-based mobile "Insulin Guide" application, the experimental group was trained for three months. No intervention was made in the control group. Three months later, HDL values of individuals in both the experimental and control groups were re-evaluated from hospital records.

The metabolic variables (Low Density Lipoprotein) of the individuals in the experimental and control groups were evaluated from hospital records. With the developed web-based mobile "Insulin Guide" application, the experimental group was trained for three months. No intervention was made in the control group. Three months later, the LDL values of individuals in both the experimental and control groups were re-evaluated from the hospital records.