How to register, login and upload photos on TCT:
If the pictures you intend to use are very large in terms of file size (>1 meg), transfering them will be cumbersome, so you'll need to resize them and make them smaller.
If you'd like to use a web-based image resizer and free online image editing site Picnik is a good bet.
If your using Windows and have a batch of images to deal with, Microsoft has free software to do this - here is an article and where to download