Some you can right click on then choose copy from the menu. Put the curser where you want it, then Cntrl V.
Some you have to "save as" somewhere like your desk top then choose images at the top, pick a folder like photo, or video. choose Upload to Cz and it should go to your desk top for you to find and double click on. This will bring it into CZ. Choose upload. Find the CZ URL. If you use the Text editor it should post the image, the other two editors will just be the CZ URL.
Hope I didn't screw that up, it's been a while.