Change my Apple Store password Is

Unfortunately, we cannot change it, as we are only users of Apple products like you. But you can do it. If you have forgotten your Apple ID Password and still have access to your Apple ID on a device, you can change the code.

See here how to change your Apple ID Password:

Change your Apple ID password - Apple Support

If you do NOT have access to a device with your Apple ID, start here:

If you forgot your Apple ID password - Apple Support