Welcome to the club
I edited your post to make the pics show up, you were almost there

You posted the correct link, just one extra step needed... once you paste the link, highlight it and press the button that says 'Img' it will add a few bits to the start and end of the link you pasted and that's all that's needed. It's located above the text box when you're typing.
Have a look at your original post in this thread, click on 'edit' and you'll see the change i made. Let me know if you need anything else!
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How to post pics: When writing a message, scroll down and use the "attach file" option. Where possible, a photo sharing service can be used such as Flickr, Imgur etc. The image location (usually ending in .jpg) can be copy and pasted between the ][ brackets that appear when you click the 'Img' button (you can find this button at the top of the message box).
How to post youtube vids: Click on the 'youtubeHD' button at the top of the message box and in the middle of the ][ brackets that just appeared, copy and paste everything from the youtube web address that appears after the = sign i.e if this is the url:
https://www.youtube.com/watch?v=K2cNqaPSHv0 just copy "K2cNqaPSHv0").