you need quotes around the word like "this" and follow immediately by the colon :
The link itself follows, including the http and slashes
no spaces allowed anywhere between words or symbols on the linked text.
Look to the right of the message Reply box for the basic instructions for posting Bold, Italic, Images and Links
Combining more than one command in one sentence often leads to errors .. i'm not sure why .. things like italic + bold or two separate bold-font words often dont show up correctly.