Hi Scott,
Learning about SQL queries is handy, although it's something you can usually avoid because there is usually more than one way to do something.
If you want to learn more, I suggest you do it on a test site, and never on a real site. There are two ways to execute an SQL query. One is from the command line, the other is through phpMyAdmin.
When you're inside phpMyAdmin and you choose a data base, there will be a query tab at the top. Here are some directions I copied from a forum post that show the steps.
1] Go into phpMyAdmin. On the left side, click the name of the database you are using..
2] On the right side, once the page loads, scroll down and find the box that says "Run SQL query/queries on database yourdatabasename" above it.
3] In that box, type (or copy and paste) the query you were told to run.
4] Press the Go button.
5] If your query is successful, it will reload the page and at the very top say "xxx has been yyy" where xxx is the name of the table or field you performed yyy action on, or give a blank white screen. Otherwise, it will give an error message.
You sound a little unsure of yourself in this area. If you want to attempt it, set up another site for testing so you can trash it all you want:) Use the help that comes with phpMyAdmin and ask us questions when you get stuck.
You an also get a lot of help from other forums on phpMyAdmin. Let us know if you want to learn more.
Cheers,
Ed