I need an little application that will pop up a reminder on the same day of every month, and crucially, *leave it on the screen until I manually close the window*. There are lots of notify tools, but they just pop up a little notice for 10-20 seconds and then the notice disappears.
So far the only thing I have found is Remind, and its GUI tool, Tkremind. I've installed both, and they run, but there is no documentation other than a man page, which I can't figure out. That is, I created a reminder, but it never appears, so clearly I haven't done it right. The purpose is to pay a bill that comes due every month on the 20th, and each month with a different amount. I could set up an auto-pay with my bank, but not if the amount varies. The vendor also has an auto-pay option, but to use it I have to give them my credit card number and authorization to charge it for whatever they want. No thanks, I'm not that stupid. I could probably figure out how to use cron, but cron needs to call a program to do the announcement. Or at least I think it does. Cron is a mystery to me. Surely there exists a simple, understandable reminder app. Any suggestions?