So my wife and I are trying to save some cash because we just moved into a new apartment in Austin and money is super tight right now. I really need to get one of those Ninja Creami machines because she's obsessed with them but they're like 200 bucks right now and I know they go on sale. I heard someone at work talking about using a chrome extension specifically for walmart rollbacks to track prices so you get an email when it drops but honestly i have no idea how any of this works. I downloaded something that looks like a little blue price tag in my browser but I'm just staring at it and nothing is happening lol. I'm usually not this bad with tech but this is just confusing me. Like do I have to keep the tab open all day for it to work or does it just scan in the background? My budget is really like $150 max and I'm hoping to get it before her birthday next month.

Sorry if this is a total noob question but how do I actually tell the extension which item to watch? I clicked a bunch of buttons but I don't see anywhere to put my email or a notify me thing. Do I need to be logged into my walmart account for the extension to talk to the website or what? I really want to catch a rollback before they sell out...