How can I enable the software update setting

Hi, Aymen.
To solve your issue, follow these simple steps.

• Make sure your device is completely charged and connected to Wi-Fi.

• Swipe down from the Notification bar and select Settings.

• Scroll down and select "Software update".

• Select "Check for updates", then select "OK".

• Follow the on-screen prompts to download and install the update.

Cheers,
Exiled.