1. Go to Weight Loss Goals and reset the figures there, ensuring to select pounds and enter a pounds figure (eg don't put 74 lbs if you're 74 kgs). Make sure you set the goal weight, too.
2. On your spark page (although I think you can do it from the page in 1, not sure) edit your ticker to use imperial values, not metric values.
3. Check on Account/Email Preferences that you do NOT have the "use metric system" box checked.
4. Weigh in. Your last weigh-in would presumably be a kg figure. You'll need a new weigh-in with a new imperial figure.
Do all of those, and you're in Imperial.
Note that past history doesn't change on the reports. You'll show as having weighed very little at previous weigh-ins where you recorded a kg figure. It won't show you changed system, you'll just show has having gone from weighing 74lbs to weighing 162. :)
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