I want to enable/disable notifications from application.

Here are the instructions on how to set notification preferences:

To enable notifications: go to Settings on your device > select the Notifications section > choose the MuscleBooster app > turn on all the settings. After that, you'll be able to configure the notifications settings in the app.

To disable notifications: go to Settings in the MuscleBooster application > open the Reminders section > scroll down the settings list > tap the 'Turn all reminders off' button.

For further customization: go to Settings in the MuscleBooster application > open the Reminders section > choose which settings you'd like to turn on/turn off.