Afternoon DWheeler,
If you have processed at least one payroll, which includes the employee, that has not provided details, the steps are as follows:
Log into your ATO portal > access your client/self > Business > employee super accounts > enter employee details, TFN, date of birth, address and request. All this is under the Business Header where the STP reporting etc.
Please remember to include in your employee engagement letters that your default fund or stapled fund look up will be used if the information is not provided.
Happy Stapled Fund Look Up.