Both the above pages now use an image uploader program that your browser will try and install. The program gives folder navigation of your computer and provides thumbnail views of your images, allowing you to select which ones you'd like to upload and giving the option of rotating and setting the title for each.
If you do not wish to install any programs to facilitate the task of uploading images, then use the old version of the page, a link for which is provided in the top right corner of the "add to" Free and Private gallery pages.
If you are using Internet Explorer you should allow the ActiveX control to install, you'll be prompted either across the top of the screen and/or a pop-up will appear asking whether you wish to install it.
If you are using any other java compliant browser then a java applet will download and install, subject to the security settings of your computer.