@Mohamed_Ahmed To verify ownership of the domain follow these instructions:
https://answers.netlify.com/t/support-guide-verifying-domain-ownership-for-netlify-custom-domain/13765
The value that you would use is:
https://answers.netlify.com/t/request-verification/135284
Once you’ve added the record let Netlify know by posting here again, then just wait until their support staff confirm you did it correctly, and then perform the removal for you.