Ensure you have 'fixed tasks and settings enabled' on your user profile. Level 5's can add this within the user profiles.
Navigate to the site, click on the cog icon to access the sites General Settings
Tick Flex Enabled (this will override your labour %'s that might have been uploaded via financial planning)
Set your base wage, base sales and flex %
These changes will automatically be applied to the current and future weeks. If you have any questions please speak to your account manager or reach out to S4labour@s4labour.co.uk for support.