2K didn't put in a way to add legends this year but you can still do it if you use a workaround. Go in Season Mode (Association Mode doesn't work) and customize the league so that you have the team with your legend in the league. Play as that team and then immediately export the team.
Go back to the main menu, load up the team, and replace MJ with some random player in free agency. He should be added to your free agency pool and can be put on any team you want.
Yeah it's a pain to get around it this year (shoulda left it like last year 2K!), but using the above method I was able to get Jordan on the current Bulls starting next to D-Rose! It's Championship time! --- PSN: YevinOrion | XBL: Dirty Machete