Without seeng the lay out of the page I'm not going to be much help
However I do have 2 programs that upload files to sites and the Method is similar So you can do something like this.
Ok first thing is you want your files with your pics saved on your computer and make a note of the Location.
The "My Pictures" folder is Easy to find on the Desktop but the folder is Labelled as
C:\Documents and Settings\..... as may be several more folders

But as you have them saved elsewhere the same things will apply OK?
But write down the address at the end of the link, so when you look for it the right file will be accessed
Skip this step if you have already know what file to send and their location

Next go back to the site have the location ready and press the Upload button a message will come up asking about the location of the Pics and the File name probably a double entry box So in the location box you can paste the Full address of the location on the computer
right click on the folder and copy the address of the Folder which will be something like this example
C:\Documents and Settings\computername-RANDOMXX\My Documents
Now in the other box copy the name of the File in full May have to click on Properties to see this?
Next ...Moment of truth
Press the Send or Upload button and If you get a message saying its been accepted, Repeat for the other files. Just alter the File name in the Name box