The Up Next button is missing on I Tunes after my re ent upgrade. How to I now create a queue?

To add songs to your Up Next queue you need to Force Touch the song you want to add to the queue and select Play Next. The song will be added to your Up Next queue and will play right after the currently playing song ends. What you may or may not find in the Force Touch menu is the Play Letter option that replaced the Add to Up Next option on previous versions. Whatever you add to the queue as Play Next will literally play next unless you rearrange it once on queue. Some have reported getting the Play Later option in some instances and then it goes away. Me, I haven't seen it even once. Hope this helps.