Sort:  

Just unvote the witnesses you have (e.g., anarcho-andrei, gmuxx, sircork) and then vote noblewitness. You may rewatch the video as I explain within the rambling two methods of doing this using:

https://steemit.com/~witnesses

https://steemian.info

The explanation/demonstration is at about 27:00 minutes into the video.

Hope this helps.

got it thanks done!