Editing a Playlist

It’s really easy to add or delete videos in a given Playlist. It’s also very easy to specify in which order you want your videos in a given Playlist to be listed.
Adding Videos to a Playlist
There are two ways to do this:
1) Add or one or more Smart Tags to your Playlist, so that the videos with those tags will be pulled in and included.
2) Go to your Library, click on the Title of the video you want to include in your Playlist and then add one or more of the Smart Tags you know your Playlist is based on.
Deleting Videos in a Playlist
There are two ways to do this:
1) Delete one or more Smart Tags in your Playlist, so that all videos with those specific tags will no longer be pulled in and included.
2) Go to your Library, click on the Title of the video you want to delete from your Playlist and then delete the specific Smart Tags you know your Playlist is based on.
Sorting Videos in a Playlist
 You can sort the videos in a given Playlist in various ways:
Created at (date of uploading)
Updated at (date of last change)
By Title
Number of plays of the video
Furthermore, you can refine your sorting by stating if you wish your videos to be listed in ascending or descending order.

So, my playlist is done. But how do I edit it?