Large photos can significantly slow down our website. The ideal size is 400X300. The ideal orientation is landscape. Below is a link to a free website that will allow you to resize your photos before you upload them to the website:
The upload tool is located in the column to the right. The Browse button will allow you to browse your computer for the photos you have prepared for upload. You'll have to select the photos one at a time and then click Upload File. This will add the photo the the slideshow that everyone sees.
Below the Upload File button is a tool that allows browsing all photos on the site.