The image shows the Build Pipeline - AppExtn - Deploy to Sandbox screen where you set the Sandbox parameter name. There is an "X" icon to the right of the screen's title. Click that to close the screen. The Configure Parameters area is below the gray shaded title bar and it contains one field, Sandbox. The field is filled out with this data: $abc01def2fedcba12345ab01234". This instruction is below the field: "Enter the sandbox name" Below the area, and to the right side of the screen are two buttons: Cancel and Build Now (active).