I didn't re-size them.
I simply followed the link to you imageshack account, found the same photos you posted and then clicked on the embedd button.

I copied the URL address in the embed button and pasted the address here.

for example the last photos has a URL that starts with http.

*http://img854.imageshack.us/img854/2485/dsc0376xx.jpg*

And ends with .jpg

I then simply typed [IMG] before the URL. (This is called the opening image tag)
and then typed [/IMG] after the URL. (This with the / is called the closing image tag)