hiding author page

hello,
in the posts, the authors name appears in the footer. the name is a link to something like an “authors page”.
searching my webpage with google, this authors page appears in the results, too.
the address of the page is

https://www.xxyyzz.com/author/”username”

wordpress doesn’t allow to change the username, but i don’t want it to appear anywhere.

so i would have two questions

– is there a way to change the address of the page?
– is there a way to hide or completely delete the author page, so it cannot appear anywhere?

would be great to find help!
thank you in advance
best
matís