Help. I am completely new to website building and concrete 5. Absolute beginner so appreciate your patience.

I want to remove the "Sign-in" at the bottom of the page. Have seen most of the answers and have tried them but something is not working.
1. after logging on to the site, themese/greensalad/customise/add your css and then added individually and then together the following (one to remove, the second to hide);
.sign-in {display:none;}
.powered-by{visibility:hidden;}

Clicked on ok and then save. I can see that the "sign-in" is removed on the site. But when I log out, and go to the site, it's still on the site!

cleared the cache, same thing.

Clicked on "view source" on the site and there is some coding:
<span class="sign-in"><a href="/index.php/login/">Sign In to Edit this Site</a></span>

So then I stumbled my way to my hosting company. Found the following files:
/home/concrete/themes/greensalad/elements and then selected the footer.php

I deleted the above coding, saved, refreshed, signed-out.

And it's still there.

Please help....using very "idiot-proof" directions please.

Thank you.