An endless cycle of creation and response on the Internet is called

A feedback loop

Explanation: A feedback loop involves some kind of output that is then returned or fed back into the original process.

assuming you are in the home page.

1) go to the upper right hand corner

2) click on your "profile picture"

3) go down to "edit profile"

4) it should be titled as "edit your profile", click on "profile picture"

5) choose a file

6) press "change"

you're profile picture is updated

~

answer; availability;