Should be 2 buttons on the remote. One button you use to turn the alarm on and off. Press and hold the other button for about 5 seconds. Alarm should sound 1 long low tone beep and the tamper setting should now be on.
Only problem is that the bike will bleep every 30 seconds or so to let you know it's in the anti tamper mode .... only problem I have with this is the sound it makes at night on a quiet street .... dead give a way that there is a bike in my garage