Hi Van, in the General chit chat forums (please see link below) scroll right to the bottom of the page and create a topic. Use the small mountain like icon that says “Insert/edit image” and upload the image you wish
General Photo Chit Chat
If you are using Flickr or Imgur, you can share the link to the image from there. Here are some instructions for you to get started.
https://www.lightstalking.us/forums/topic/getting-started-faqs/
Hope this helps.
There are also challenges and throw downs that you can take part in. See you at the forums 🙂