How do I use reminders in Fuelio? Zero cost every 600 km.

Hi u/devAdrian or anyone else who uses Fuelio! I don't understand how reminders work. I want to be reminded to lubricate my drive chain every 600 km. My last lubrication was at 14350 (odometer).

I created a reminder at 14950 repeating every 600 km. Note: Lubricating costs nothing -- I have a big jug of gear oil.

My bike is now at 14930.

How do I go about recording a lubrication now and getting a reminder after another 600km (which is 15530)? I am confused.