To change your iRODS password in the users.hydroshare.org iRODS hydroshareuserZone, login into a linux terminal with iRODS iCommands installed and enter the command "ipasswd" - it will prompt you for your current and new password.
If you have lost or forgotten your current iRODS password in the users.hydroshare.org iRODS hydroshareuserZone, send email to help@cuahsi.org with your iRODS username, and your iRODS password will be reset by a HydroShare iRODS administrator who will email you back with a temporary password that you should change via the "ipasswd" iRODS iCommand upon next login to the users.hydroshare.org iRODS hydroshareuserZone.