To upload photos from your computer or smart phone, click on "Add a Photo" button (above). 

Then click on the "Browse" button and you will be able to choose the location in your computer / phone where your photos are stored. For many people, this is under the Pictures or Photos file/icon on your computer/phone.  Upload one photo at a time so that you can give it a caption.

Note:  It may take up to 24 hours for your photo(s) to post as it needs to be authenticated first.