@TheBristolSimmer It's pretty easy, really. You need to find an image hosting site and upload your pics. You then copy the link provided at the host site and paste it in the box that opens when you click on the icon that looks like a page with a bent corner at the top of the message box.
Probably not a good idea to use randomized sims because they use only the default features found in CAS. You can get some nice looking sims that way, but much better to play around with the sliders a little on your own so you have something unique :) Good luck!