Importing photos is done in the 'Media' section of the site. Click on 'Add new Album' and a follow the steps for naming the album, giving it a description and placing it in a category as well as choosing a frame for the photos you'd like to upload.
The next step is to begin uploading photos. You can upload photos one-by-one or add many photos at once using the multiple photo upload option.
In order to use the multiple upload option, you will be prompted to download a component the first time you use the uploader.
After that, you can upload as many photos as you wish. Take note that in the upper right hand corner of the photo upload page, there is a box that shows you the amount of space remaining in your family site to help you stay within the quota.