I am not sure what you mean? Do you want to highlight them in blue or make links clickable?
To highlight in blue, you need to type:
[color= blue] Kenneth [/ color] (without any spaces)
you then get:
Kenneth
To make a link clickable
Eg.
http://www.channel4.com/bigbrother/h...s/kenneth.html
[ url=http://www.channel4.com/bigbrother/housemates/kenneth.html]Kenneth [/url] (again with no spaces)
you then get:
Kenneth (which is now a clickable link).
Capiche?