Updated for 7.0
On the left-hand side of the screen in the navigation bar under EVENTS, select Parade. This will take you here:
Select Organizations within the top bar and select List. This will take you here:
Within the box labeled Parading Groups and Organizations, select the desired parading organization. A pop-up window will appear that looks like this:
In the pop-up window, click the Edit button in the top left-hand corner. Your pop-up will now look like this:
To edit name of the parading organization, its description, the type of organization, mailing address, and contact information, click the respective boxes.
When done, click the Update Parade Organization located at the bottom of the pop-up window to save changes.
These are samples.