Screen Share

I have done many steps that I found online about sharing my screen on my HP laptop,  but nothing works. I am the only HOST and cannot share my screen. I use ZOOM daily and cannot share. I have the SHARE button on the bottom of my screen. When a participant enters, a message pops up "You are restricted in sharing in this meeting." My participants can share. I downloaded a new version of Zoom to no avail.  Please help! Thank you!