I'm on a Mac and use this application to resize photo files, it is ImageWell a free editor, it can be found here:ImageWell for Mac - Free software downloads and software reviews - CNET Download.com

If you are windows bound just look around the web page and find an intel version of a similar product, many are free to download.

To delete photos look for "manage attachments" open that you will see your photo files, check box lower right corner of each photo, check it, there is also a check box to select all. This is in the home panel, if they are in the attachments window just check each photo lower right corner.

Good luck