Changing a wordpress user to an admin

1st PROBLEM: How can I change myself from a user to an admin IF I cannot reach the creator/current Admin?

(*) NOTE: I have Version 3.7.3
(*) NOTE: http://www.whois.com/whois/testsellyourhome.com

Paid someone to build my WP website. They told me they’d give me a tutorial (never did), that I’d be an Admin and be able to control my site BUT I cannot. I found out that I am NOT an Admin and that is why I cannot perform the below items on: http://testsellyourhome.com/

I installed “FileZilla” but don’t know what else to do. I also downloaded but did not install “phpMyAdmin” (http://sourceforge.net/projects/phpmyadmin/?source=dlp) – is this a step in right direction? I did not install “phpMyAdmin” yet b/c there are a lot of files in the zip folder and it did not automatically RUN/install.

2nd PROBLEM: “How to” Items #1 – 3

(1) Download WordPress 3.9 & set up for AUTO updates ?

(2) Verify my WordPress Website in Google Webmaster Tools by uploading the Google HTML verification code to my website?
CODE: google-site-verification: google70336b09ce2d28b3.html
(https://www.youtube.com/watch?v=OQxHK05BGWI)

(3) Add a Tracking Snippet to header of my website?

SNIPPET:

<!–VISISTAT SNIPPET//–>
<script type=”text/javascript”>
//<![CDATA[
var DID=231081;
var pcheck=(window.location.protocol == “https:”) ? “https://sniff.visistat.com/live.js&#8221;:”http://stats.visistat.com/live.js&#8221;;
document.writeln(‘<scr’+’ipt src=”‘+pcheck+'” type=”text\/javascript”><\/scr’+’ipt>’);
//]]>
</script>
<!–VISISTAT SNIPPET//–>

THANK YOU !!