Inserting image tutorial:
1) BV, you pasted the url to another page. So click that and the subsequent page, right click the image and on the little menu that pops up, click "Copy image URL" or whatever similar prompt. So now you have the direct link to the image. You can test this by pasting that into the address bar and seeing if only the image
shows up in the resulting page.
2) After getting the url to the image, just paste that URL into the post.
3) Hilight the entire url you just pasted, then click the little picture frame image (located above the text box where you type, on the left, above the smilies. YOu should see a round pinwheel looking thingy, then the picture frame, then a globe looking thingy). This will insert the proper image tags to make the picture visible instead of just the link.
3b) Alternately, instead of clicking the picture frame thingy, you could type the image tags around the url.
SO, this is the image url pasted into a posthttp://cdn.instructables.com/FDU/RN97/F5HVPDC8/FDURN97F5HVPDC8.LARGE.jpg
With the tags
This is the result of an image url pasted into a post with the tags