Awesome colors (and welcome back to the forum).
To insert the image in your post, you can either upload it or from Flickr, choose "see all sizes", select the size you wish to post (small, medium or large) then copy the URL. On the post you want to insert the image, click on the little yellow icon (it looks like the landscape icon we see on cameras). A little window will open. Paste the URL you copied from Flickr and click OK. Then submit the post. Your image will appear in your post.