I think that option has been removed in its latest update (4/25). Right now, I am left with three options: "Check in", "Location History" and "Location Settings". I don't know if the removal is an oversight, or intentional.
Same for me. Now when you click your little icon, it brings up a popup window with only Check In, Location History, and Location Settings. Maybe they figure that if a friend wants to know where you are, they'll have Latitude also and will just open up the app and see where you are.
I did notice if you tap the map and a location bubble comes up, tap the bubble. Scroll down a ways on the location page and you'll see a section for "More Actions", with a "Share this place" option. I think they just moved the share button way down there.
Thank you! Indeed it can be brought up from that bubble. My phone doesn't always show me that bubble, that's why. But that is a separate problem. Feel relief that I don't have to download another app for this. Thanks again!