Select Chart of Setup from the Employer/Setup drop down menu. Now click on Change PAYE under E-FILING. The screen displays the HMRC Office details that you entered when signing up. To edit the Employer HMRC Office Details, click on Edit. Enter your Employer’s PAYE reference. It can be found on any documents or correspondence received from the tax office, such as the welcome pack given by HMRC when you first registered as an employer or on any payslips, P45s, P60s or P11Ds issued to previous or current employees. Similarly update all other HMRC office details if they have changed and click on the Save button to save the changes you made.