Method 1. Integrated Leaderboards
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1.To use the integrated leaderboards make sure the leaderboard is enabled in your leaderboard.yml (most of them are on by default)
2. Use /moveleaderboard to move the leaderboard of your choice
(3?) Did it not show up, try reloading/restarting if that didn't work try another method.

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Method 2. Holographic Displays
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1. Enable use-holographicdisplays in your leaderboard.yml (this will fix the duplication glitch that occurs for some users)
2. Use /moveleaderboard to move the leaderboard of your choice
(3?) Did it not show up, try reloading/restarting if that didn't work try another method.

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Method 3. Placeholders
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1. Install Holographic Placeholders, ProtocolLib and Holographic Displays (You also need either PlaceholderAPI or MVDWPlaceholderAPI)
2. Create a leaderboard like you normally would, you can add lines like this: /hd addline {medium}1. %pvpstats_kills_1% | %pvpstats_kills_1_amount%
This is probably the best way to do it since it has the lowest chance to cause issues, but it's also the most work