You can also use LIGHSHOT - screenshot tool for MAC & WIN. Here is download page: Lightshot — screenshot tool for Mac & Win
If you register and then sign you can make your own gallery, or you can upload your images on forum (make album).

1. Here is one way to make screenshot and upload image, but if you do this way, after some time image dissapear (watch the video):


2. I usually record image on my PC edit with Photoscape and then upload on my lighshot gallery (but I had to register and sign to make that Gallery). Here is my gallery:

(open image in new tab then copy image adress and paste...)

3. Sometimes I recorded images on my PC put in an album on forum.

Here is one more video: