How to setup my url for flask app deployed on App Engine?

[tempdeltavalue]

Hi, recently I deployed to static site (on cloud storage) and where for navigation to custom url was neeed to change name of bucket ...

https://cloud.google.com/storage/docs/hosting-static-website#uploading

Now, I'm deployed flask app and whant to migrate to  my url ..
And my question .. how to do that ?)

I asssume I need to change something in yaml file 

 https://cloud.google.com/appengine/docs/flexible/python/reference/app-yaml

but I didn't find anything ..