Welcome to Best Boards Hinora_Damasse.
A personal icon sits on the right side of a username like I have the ICQ flower and then a personal picture is like the picture that displays under the username and it a bit bigger then the personal icon-like my weird animated scientist guy-he is my personal pic.
You can get them all over the web-many places offer all kinds of clipart and if you have something in mind already to search for you can go to google and run asearch for any images that fit what you need.
Next you'll have to upload them somewhere so that you can link to them
and have them display on your posts.
If you don't already have a website or webspace you can use I would recommend calling your Internet Service Provider and asking them if any webspace is included with your monthly internet access charges-usually between 5-15 megs is complimentary for customers so it's definitely worth a call-if they do offer it you will need to activate it and get the FTP (File Transfer Protocol-program used to transfer files from your hard drive to a 'remote host') settings to get started.
As for the browser needing to be closed-what browser are you using and what version? If you have Internet Explorer you can go to the 'Help' menu at the top and scroll down to about IE and it will tell you what version you have.