You can upload images and files by going to "Manage Images and Files".

Next Click on the Folder you wish to upload your images to on the left or create a new folder.
Then click on "upload new files"

Next click select the files from your computer ( you can choose multiple files at a time)

Click on "open" after selecting multiple files (NOTE: you can hold down SHIFT or CTRL to select multiple files)
Next click the "Upload" button and watch the dialog box move accross your screen.

Any questions or issues please feel free to contact support.
http://ticket.websiteforge.com