I always used imgur for me to upload pictures when it is needed. Regardless i don't upload photos that much because now i'm focusing more on how to make good quality posts that can help me in the future. Goodluck on your journey to become a Jr. Member rank. By the way to become a Jr. Member is easy, you'll only need one merit and 30 activities. The desicion is up to you.
I never saw where the OP indicated that he intended to write a post with image examples, instead, the post stated that the OP wanted to know how to add an image. He also does not need to include a picture to gain merit, but if it is essential to do so, he must do so, especially for demonstrative purposes.