Select "advanced" right below the box you post in. Above the box is a little paper clip. Click on it. At the top of that screen you will see "chose file" click that and it will give you options on where your photos are that you would like to upload. You can upload photos from whatever device you are on from there or dropbox, google+ etc. Once you find your photo, select it and next to that previous option I mentioned "chose file" you will find an option "upload" select it. After it is through uploading, some pics take longer than others, you can then close that window and get back on your post screen. Choose "preview post" to see your photo! That is how I attached this pic of my cute toy poodle Fancy. Hope that works for you!