In prayer times, it asks me for permission to launch the program each time before alerting me about the current prayer. What can I do?

Nothing unfortuantely. Most mobiles do not support auto-alerting feature present in prayer times. Most mobiles give these 'silent alerts' to users asking them permission each time before launching the software. In some cases you can set the permission to 'allow everytime', which works for some mobiles but may not for the rest.

For this reason the auto alert feature should not be relied upon. If your mobile supports running the application in background, please keep the program running in order to get accurate prayer alerts.