Can't reset scale

SOURCE: I have a tanita tbf-612

Press the Set and Up Arrow buttons at the same time. Release the buttons, the display will flash. Press the Arrow button to cycle through each weight mode until just the mode that you require is displayed. Then press Set. The display screen will flash to confirm your selection and store in memory.
Note: If weight mode is set to pounds or stone-pounds, the height programming mode will be automatically set to feet and inches. Similarly, if kilograms is selected, height will be automatically set to centimeters.

SOURCE: setting is in metric instead of pounds

On my model, there is a button on the bottom that slides back and forth to choose the wanted setting. My scale is about 5 years old.

SOURCE: bought w/watcher glass scales and changed battery

Incorrect in what way?

SOURCE: metric instead of pounds

You didn't mention brand name or model number, so not sure about your specific case. However, on my scale, there is a switch or button near the battery compartment. It allows you to change the measurement between stones, pounds and kilograms. 

SOURCE: When I turn on scales, Err appears which is an

I contacted Salter and unfortunately the scales cant be repaired. Could you please remove my request. Thank you.