OK, I'm working on it. By any chance, do you have a 2 meter repeater close by?
yes I do have a repeater system here my node is simplex and I leave it connected to the Alaska reflector. a reflector is just a hub that lets multiple nodes communicate. so once you have found a node in your area either simplex or connected to a repeater it's a matter of disconnecting with a 73 command than re connecting with a 9070 command. the best way to find a node in your area is go to the irlp web site do a search with your zip code.
it will give you all kinds of info most important is contact for the node owner some owners like to keep their nodes secure others are like me and leave them open for any one to use or direct where ever they want. I have found most clubs that have a node connected to their repeater system like to leave it disconnected when not in use. my opinion is that's a waste, but opinions are like a holes every one has one and mine doesn't stink.
there are no requirements to announce you are going to shut down the node. again some locals like some kind of announcement my suggestion is disconnect than announce it why share your local requirements with the world . other wise enjoy your new hobby I have had a great time with it.