If you want to delete a specific tag, all you'll need to do is follow a few simple steps:
Click on Audience in the top navigation menu and choose "Tags".
Find the tag you’d like to delete, click on “...” button, and select “Delete tag”.
Confirm you’d like to really delete the tag.
This action cannot be undone and deleted tags cannot be restored.
And that’s it! Feel free to repeat the same process for any other tags you want to be deleted.