You can set your preferred units such as kilojoules instead of calories, imperial units (lb, feet, in) instead of metric (kg, cm), your preferred RDI source (uk, us, nz, au), and your preferred default food composition database (us, uk, nz, au).
To do that, go to your Profile page and then click on Preferences.
After that, select your preferred units and click on "Update Profile".
That's it, now all the pages will reflect your preferences 🎉