Alarm for single level sensor

Greetings fellow aquarists. I got myself a level sensor so that I might sound an alarm if filling up the aquarium and happen to forget about it.

Now, my problem is that I not can figure out how to do it. Normally programmable logic has a if THIS AND THAT DO THINGY. But in the software I can not do such a thing.

I would be delighted if this could be added to the firmware/software but understand it may entail a small amount of programming. Maybe you could illuminate my understanding with a hack if nothing else?

I have firmware 6.06 and a p3. I would like to sound an alarm when maintenance and level sensor is true.

Thank you for efforts in making a better aquarium computer :-)