Some additional points beyond what Ken L went over:
Victoria, are you trying to post a profile/avatar picture of yourself that replaces the generic one of the tan dulcimer?...one that will show to the left of your posts?
If that's what you're trying to do, then you need to go into your Settings to replace the generic image.
There are two easy ways to get to your account Settings:
1) go to your Profile page, and click on the GEAR icon at the right top corner to the right of your large name. Once in your Settings, notice that there are two tabs: one for Profile and one for Account. Go to both those Tabs and follow the directions to upload your picture for your avatar (one pic will show only on your Profile page, and the other will show next to all your posts elsewhere the site. They can both be the same picture if you like).
2) the other quick way to get to your member settings is to hover over your name at the very top of any page here, on the right... the drop down menu will appear and just click on "account settings" - it will take you to the same place in your profile settings where you'll see those two tabs for Profile and Account.
If you see a bunch of weird code- it may be a bug of some sort in the site coding. If it is, I'll need you to tell me exactly what your steps were that make the code pop up, and a screenshot of the odd code you see would be invaluable to me in tracking down the problem and fixing it. If you're seeing an error message, then I'd need to know exactly what the message says, and what steps you did that produce the message. If I can't reproduce a bug or get detailed descriptions of how it happens, then it becomes very difficult to track it down and fix it. Thanks!~
Those irritated by grain of sand best avoid beach.
-Strumelia proverb c.1990