Information about exporting photographs in Lightroom CC
Which Lightroom CC are you talking about? The mobile version or the desktop version? On the desktop version you must choose 'File - Save to' and then choose JPEG. On the mobile iOS version there are different options, such as 'Share', 'Save to Camera Roll', 'Save to Files'. All should create a new version with the Lightroom edits applied. I don't have the Android version but that will be similar.