Need a little help. I'm unable to change from pump 1 to pump 2 or 3 while programing either on manual, auto or custom. On the pump "screen" it will show pump 1 with the number 1 highlighted, if I press the up or down arrows there is no change. I've tried to google it, but am unable to find anything relevant. Instructions seem straight forward from a programming standpoint. Hoping someone can weigh in on this. Just picked this unit up, hoping this is not a programming issue and just something I'm missing. Thanks

