With Flicker it is not as easy.. you have to open the picture so it is whatever size you want and so you can right click on the picture to get the URL (right click the picture and view image info in firefox or right click and properties in IE... you have to be on a picture that give you the properties though... thus actually opening a size in flicker)
But if you have more than 8 or 10 photos per post it is easier to just give a link to your host like you did.... most forums only allow 5-10 pics per post. and it is a pain to find and add all the address links
But here is an example.. I grabbed the URL for one of your pics
Eg... "http://farm7.static.flickr.com/6147/5928790244_3c7b6eac9d_z.jpg"
Then when composing a message click the little icon in the toolbar which lets you format the message (2nd to the right of the smiley face that looks like a little picture of some scenery), this gives a box where you can post the URL and then send the post...
Like this