The Xhome touchpad? Why do you need to change it?
Can you please explain in a bit more detail what you mean by "reset my app"? I pulled up your account & see successful sign in activity via the XH app.
If you'd like to update the password for your Xfinity Usernames, you can do so by following the steps in the following support article: https://www.xfinity.com/support/account/changing-or-resetting-your-password/
Please let me know if the above helps answer your question.