From the 16th of September 2014 you can now upload images, screen captues and much more from your PC. ShareX is an utility for Windows that allows you to upload images, screen captures, text and other kind of content using UploadMe's API platform.
ShareX is free and Open Source! You can download it from the ShareX website and once downloaded proceed to install it in your computer.
For a step-by-step guide including images on setting up ShareX with UploadMe please see http://uploadme.me/page/sharex-step-by-step.