Which Accufit tracker do you have? The instructions for the T5 and the T5S are available on the manufacturer's site: http://accutimewatch.com/tracker.html
. For the T5, there is only one button. Press the button (Start App button on the side opposite the USB port) until you see the time. The date will appear in three seconds. While the display is on, press and hold that button for 3 seconds until the hour flashes. Press the button several times until the current hour is displayed. Press and hold the button for another three seconds until the minutes flash. Press the button repeatedly until the time is correct. Repeat the press and hold step followed by the repeated presses of the button for each of the additional settings: month, date, year, 12/24 hour clock, height, and weight. Alternatively, you can use the software (if you have a Windows OS computer) to set these. Then synch the tracker and the computer software.
The T5S has two buttons on the side. Press the lower button (Start/Reset) to display the time. Then press and hold the upper button until the hour flashes. Press and release the upper button to decrease the hour. Press and release the lower button to increase the hour. Repeat the press and release steps until the correct hour is reached. Press and hold the upper button until the minutes flash. Repeat the press and release steps until the correct time is displayed. Repeat the above steps to set the month, date, year and 12/24 hour clock setting. Allow the tracker to exit the setting time menu. Then press the lower button twice (or until you see the step screen). Then press and hold the upper button to set your height in feet and inches with the press and release pattern above. Press and hold the upper button to get to the set your weight menu and press and release the buttons as needed to get the correct weight entered.
I hope this helps.