The outstanding tech support for DataSprings helped me along with this project with the following code. I post it here in case it helps anyone else. What the following script does is find the associated dnn username with a dynamic forms UserID, set a date, and then pass these to a stored procedure.
Declare @MyUserName nvarchar(200)
Set @MyUserName =(Select Username from Users where UserID = $(UserID))
Declare @MyDate nvarchar(200)
Set @MyDate = (Select GetDate())
EXEC test.dbo.test2 @MyUserName, @MyDate