Can't select image to upload

Hello, after i enabled the plugin and added the ClientID (tried normal application & anonymous application) i tried to press on the field at the left or after changing it to the bottom, the field at the bottom with the imgur logo on it. My Curser changed to an Hand but nothing happend when pressing on the field. i then tried it with drag & drop and after doing so i noticd, that the frame lines turned red. the same issue happend tho. Would be nice, if i can get an solution for this issue as soon as possible.