You'll have to get your pics off ShutterFly first, or make sure you have a URL that is working. The latter may not be possible depending on ShutterFly's permissions, so I'd just download whatever pics you have on ShutterFly to your computer.
When you post, there will be two places where you can upload pics, I've circled them in RED.



Either one will bring up the same pop-up window where you can then click "Browse Your Device".
Select your pictures.Then click "Upload" in the upper right hand corner.
The pics will be inserted into the body of your post.
Hopefully you'll be able to get them on here because I'd like to see what you came up with!

 

A test photo one of my build projects for the 95 D1's intake addition I machined out plus the simple ram cold air addition; injector cleaning project pressure chamber,intake extension