Using data fields with a Garmin Edge device

I use my cycling Garmin Edge 130 for running too, so GRun is fantastic. Just one problem I can't figure out- Setting the Lap Distance.

In the setup fields you have to specify a lap distance in meters. I am in the US, so would like to specify a lap as a mile. I have tried the conversion to meters (1609- it is actually 1609.344, but the decimal point is not accepted). I have tried "1" also, I even tried 1000, to see if it would trip over, but all I get on the display is "0", no matter what I enter.

Can you please tell me what I am doing wrong? I want to be able to see my current lap time and my previous lap time at one mile laps.

Thanks for creating a really great datafield!