In Mapping Definition of your import task, for the WorkspaceId field, specify the name of your Asana workspace instead of Enter your Workspace name....
For the Projects field specify one or more IDs of projects to assign your tasks to instead of ["Enter you Project Id..."]. The IDs should be specified as a JSON array: the whole list must be enclosed in square brackets, the IDs must be enclosed in double quotation marks and separated with commas.