How can i share my screen (browser)

[clue0000]

Hey guys I am new and I did some research but I cannot figure it out...... I loaded OBS and I'm trying to stream to Facebook live I got it to sync up and everything and I added my video capture device and my audio input capture device but I cannot figure out how to add a screen share. My goal is I want to share my screen on a browser using Google Chrome and I want to scroll up and down the webpage while I'm talking and streaming. I watched a whole bunch of YouTube videos on how to do this but when I choose window capture it mirrors the window like a whole bunch of times and I cannot figure it out does anybody have any suggestion on how to share my screen that is not a program for example what I mean is someone showed on a YouTube video how to share a PowerPoint I don't want to share a PowerPoint I want to share a browser window........ thank you in advance