so I'm confused

I went under the post that said if your new here read this to try to see how to upload pics in a post. It said to click on the tree symbol at the bottom of the message box which I did than I clicked browse and it didnt give me the option to upload. It just said browse and also a save option which I did click save but nothing happened. I want to post some of our engagement pics but can't seem to figure it out. Any help would be awesome and appreciated! Thanks