Sure, I'd be happy to help you with that. Here are some steps on how to locate and manage your YouTube playlists:

**Locating YouTube Playlists:**

1. Open YouTube and sign in to your account.
2. Click on the three horizontal lines on the top left corner of the screen.
3. Click on "Library" at the bottom of the list.
4. Here, you can see all your playlists under "Playlists" section.

**Managing YouTube Playlists:**

1. To manage your playlists, you will need to click on the specific playlist you want to manage from the "Library".
2. Once you're in the playlist, you can click on the three dots next to each video to remove a video from the playlist, move it up or down the list, or add it to another playlist.
3. If you want to edit the playlist as a whole, you can click on the three dots under the playlist title. Here, you can add all the videos to another playlist, sort the videos, or delete the playlist.
4. You can also change the playlist's title, description, or privacy settings by clicking on "Edit" near the playlist's title.

Remember, any changes you make will automatically be saved. Let me know if you need any further assistance.