Cycles GPU Render button is looking passive I am adding a image. Why i can't use this render?. I am using Windows 10 and AMD Radeon Software. My Blender versiyon is 2.79. I did install yesterday (27.06.18) I can't find a solution for AMD Radeon and I updated very soon (27.06.18).
And I am adding a photo for you can understand better.
From the manual:


  To enable GPU rendering, go into the User Preferences, and under the
  System tab, select the Compute Device(s) to use. Next, for each scene,
  you can configure to use CPU or GPU rendering in the Render
  properties.
  
  OpenCL
  
  OpenCL is supported for GPU rendering with AMD graphics cards. (We
  only support graphics cards with GCN architecture 2.0 and above). 
  
  If your video card is supported, download the latest drivers.