I assume that your webspace is already activated as it sounds to me like you have a website up and running on it
Do you use your ISPs own template and and upload content to your website via IE or FTP ?
If you use the ISPs own software/template through IE, then you may not be able to upload to a private part of your webspace.
Its usually easier using an FTP program, I use the free one from here :
http://www.seagullsoftware.com/products/free_ftp.htmlYou have to give some details and get a key via e mail but I have never had any spam from them
Once you have that installed and setup you just drag your pictures into the directory where your index.html is for your webpage and it will be on your webspace but not on your webpage.
The link to it then would be something like :
http://www.ltpc.verizon.net/mypic1.jpgOr whatever your main site address is and the name of your .jpg/.gif/.swf file