Open Garmin Golf app.
Select
.Select Start a Round.
Select your course.
Select your tee box if applicable.
Select Share Scorecard:
After
During And After1
Not Now
Select your product to confirm this information applies to you
Privacy Options for Scorecards in the Live Leaderboards
The Garmin Golf™ app offers many choices for keeping your scorecards private or sharing them to Live Leaderboards and to use them with Live Scoring. To take advantage of Live Scoring and Live Leaderboards, scorecards must be shared. You can keep your scorecards private if you would like. Privacy settings can be changed for scorecards in the Garmin Golf app.
After last score is entered, select
.Select End Round.
Set the Lock Icon:
will not be shared. 
will be uploaded to the leaderboard.
Open Garmin Golf app.
Select Profile.
Select Leaderboard.
Select the course played.
Select appropriate scorecard.
Under Privacy select the Share Scorecard toggle to change scorecard privacy.
Open Garmin Golf app.
Select Profile.
Select your name.
Select Privacy.
Select Share Scorecard:
After
During And After1
Not Now
1 During And After round sharing of a scorecard will only work when using the Garmin Golf App as a standalone product or when using a Garmin product with Live Scoring in the Garmin Golf App.