I want to make a download and a message pops up saying my Apple ID has been disabled, pls I need help now

This is primarily a user-to-user support forum; other Apple users like you. You will need to contact Apple Support. See instructions in: If a message says 'Your account has been disabled in the App Store and iTunes' - Apple Support

When I want to make a download ,why do my phone say write your Apple ID password

That is normal. You can make changes to the password requirement in System Preferences/App Store or in Settings/iTunes & App Store.