having 2 leaders in guild

hi guys, I am leader of a guild I just started however I have a friend I want to make as a leader also. so we will have 2 leaders in my guild. I have him as a right hand now but it wont let me move him up. any suggestions on how I can do this. I see other guilds with more than 1 leader so I know it can be done but I can't figure it out.
See ,y response in your other thread