Sign in to Google+. Place your cursor in the top left corner for the Google + main menu and then click Profile.
Click the About tab, and under Links > Google+ URL, click Get URL.
You’ll see the custom URL you’ve been approved for, which you aren’t able to change. You may also need to add a few letters or numbers to make it unique to you.
Click the box next to “I agree to the Terms of Service” then click Change URL in the bottom left corner.
You may be asked to verify your account using your mobile phone number.
Проблема в том, что последних пунктов не было.
Я поставила URL, но о "asked to verify" не было.