There are 2 ways too post pics. You can upload them to the lawnsite server or link them from an outside host like photo bucket.
There is a manage attachemnts yellow bar that is below the box you type in when posting messages. Click on it and another window will appear and you can upload your pic from your pc.
Or click on the little picture icon above and copy and past the url from where the photo is hosted. Cannot be hosted on your computer.