Order of ssrs parameters

In an existing ssrs 2008, I want to add a parameter that is like userid. This will be a value the user enters as a parameter value. I want this user parameter to be the first parameter listed since I want to modify existing parameters to be cascading. I want the other parameters to limit what is displayed based upon the user value entered.

Due to that fact, can you tell me how I can make this new user parameter as the first parameter hopefully without deleting the existing paramters?