If you create a New | Report | SQL Report
Copy in the SQL, update the parameters
DECLARE @ComputerName AS nvarchar(50) = N'%ComputerName%'
DECLARE @ContractGuid AS UniqueIdentifier = N'%ContractGuid%'
Add these parameters in Query Parameters and then Report Parameters and set a default value.
In the value Provider set "Basic Parameter Value Edit Control" for 'ComputerName', add a Label Text if you'd like.
In the value Provider set "Resource Selector Parameter Value Edit Control" for 'ContractGuid'