well if the images aren't .jpg yet then you will need a program which can turn it into jpg.
programs like Adobe Photoshop, Paintshop Pro and Microsoft Paint (standard program in Windows, versions after 98 I think, are capable of setting the image to .jpg) can do this for you.
What you will need to do is open the program, open the picture and then click Save As. If you've done that, you can select the type of extension you want the pic to have. Normaly something like .bmp or .jpg is already selected. Photoshop will prolly have something like .pps or something, it's a Photoshop standard. You need to choose .jpg here and save the file.
after that you're ready to upload the picture.
simply click on Babes, then on Upload a Babe (last option in that row) and click it. Search for the file on your computer with the Search button, click it, click Open and then Submit and voila, you uploaded your picture.
within 24 hours after uploading your picture will be reviewed and if everything's okay, you will be able to see it in one of the galary's
hope that answers your question!