I cann't find the "Select Photos" button
The upload function can only used in PC, when you want to upload photos from PC to iOS devices. If you want transfer photos between iOS devices (such as from iPhone to Ipad), move here: Transfer photos and videos between iOS Devices
If you got a similar interface, no "Select Photos" button, that means your web browser doesn't support Flash Plugin or Flash Plugin not work, you can try to reinstall it.
Dowload Flash Plugin in your computer: http://get.adobe.com/flashplayer/. Notice: Please restart your web browser after installing.
If it's not work yet, recommend you to change other web browser such as: chrome, firefox.