Just grant credit in the settings. The steps are as follows:

The first step is to open the main page of the mobile phone and click Settings;

The second step is to click General;

The third step is to click Access Restrictions ;

The fourth step is to enable access to the software.

How to download software on Apple mobile phones:

The first step is to open the main page of the mobile phone and click on the APP store;

The second step is to search for the software you want to download. Software;

The third step is to click download.