Every time I open an app my Google page pops up with cashapp as the page how do I get it to stop
It might be an app that was installed from the Play Store. Try booting your phone into SAFE MODE (<< click here for details).
Safe mode is a diagnostic tool used to help determine if Play Store apps are causing problems. When your phone is in safe mode, most Play Store apps will not load or run. See how your phone works in safe mode. Try to leave the phone in safe mode long enough to test thoroughly. If the issue does not happen in safe mode then a Play Store app might be part of the problem. Sometimes just booting into safe mode > then back to normal fixes minor glitches.
Or you might have set an app as default by mistake. Open Settings and search for "default apps" and then open the Default Apps page and look through what is set as defaults for opening different things.
If you have a Pixel phone and want faster answers to questions or issues you should visit the Google Pixel help forum. https://support.google.com/pixelphone/threads?hl=en&sjid=9079951989941389854-NA
There are many more users on the Pixel help forum than there are here on the Verizon forum. You will be lucky if you ever receive a response here on the Verizon forums.