Ask for permission to install app

Guide your parents to this:

How to turn on or turn off Ask to Buy, from Approve what kids buy with Ask to Buy - Apple Support

If you're a parent or guardian, use your own device to turn on or turn off Ask to Buy.

On your iPhone, iPad, or iPod touch

1. Open the Settings app.

2. Tap your name.

3. Tap Family Sharing.

4. Tap your family member's name, then tap Ask to Buy. In iOS 15 or earlier, tap Ask to Buy then tap your family member's name.

5. Turn on or off Require Purchase Approval. 

Vince3578 wrote:

Can someone say how to disable ask to install app in app store? I know my parent need to do that but since he does not have an iphone he cant change it. Is there a way to disable that on my own iphone beacuse i cant log out my apple id due to restrictions that i also cant turn off from my own iphone

Only your parents can remove the restrictions.