First Alert Smoke/CO detector install

Since there is no documentation for installing the First Alert Smoke/CO detectors it is up to each customer to try and figure it out on their own.I bought a bunch of the smoke/CO detectors and when I began installing I started with the first one. It showed up in the Ring app with multiple devices so I thought there was a problem and removed it. Then I installed the second one and found it also had multiples... but recognized that was one for smoke and one for CO was showing up. Through the install process, it will end up only showing as one device. That is confusing to start with.I got all of the rest of them installed now and so went back to the first one to get it reinstalled. It will not install... it shows up in the app as a device that has not been installed but it will not pair with the app for configuration.How do I get it "reinstalled"?