Where can I change url:s for a project

here's anoher minor problem :-) 

copied few lines from  boinc log:

18/10/2009 09:37:24|chess960@home alpha|You used the wrong URL for this project
18/10/2009 09:37:24|chess960@home alpha|The correct URL is http://www.chess960athome.org/alpha/
18/10/2009 09:37:24|chess960@home alpha|Using the wrong URL can cause problems in some cases.
18/10/2009 09:37:24|chess960@home alpha|When convenient, detach this project, then reattach to http://www.chess960athome.org/alpha/

as far as I understand the change should be done here at projects page and then downloaded to all computers..but how...I haven't had time to work it all out (2 young kids take care of all extra time I have and that's 1 of the reasons why I started using G.R.in 1st place :-))

so thanx in advance for all help :-)

 Leffe