quick question - robbbbbbb & co.

Hello Robbbbbbb and Co.

How do you make a link in your signature? As in a whole line to a website page or youtube clip appear as one or two words in blue, like you often have Robbbbbbb.

For example, how do I turn this link below...

http://images.google.com/imgres?imgurl=http://www.boursecommunications.com.au/images/site/clock_lg.gif&imgrefurl=http://www.boursecommunications.com.au/clock/&usg=__VnrvOegPRJ5_sG-fkNIm8yN7Daw=&h=502&w=500&sz=35&hl=en&start=11&um=1&tbnid=kxek7p6jfejVsM:&tbnh=130&tbnw=129&prev=/images%3Fq%3Dinvestment%2Bclock%26hl%3Den%26rls%3Dcom.microsoft:en-au:IE-SearchBox%26rlz%3D1I7GGLG%26sa%3DX%26um%3D1



appear as 'The Interactive Investment Clock' in blue, as my signature?