How can I merge songs into an album on iTunes?

I enjoy iTunes recently I stumbled upon an issue . when I download songs whether if it's from YouTube ,CD or any other site , it's downloads to my iTunes successfully . my main problem is when I'm in the

(RECENT ADDED) section on iTunes library I left click then hold and highlight the songs then right click and select (GET INFO) I edit the information on the songs at the same time and try to merge it or better yet create as a album . just recently I updated my Mac mini to the latest software all of sudden I can't merge the songs no more on the iTunes library in the (RECENT ADDED SECTION). I'm not sure if that was case or not. however I did find alternative way, instead highlight the songs and edit information at the same time.However it allow me to edit the song (ONE) at a time instead of multiple in the (RECENT ADDED SECTION) on iTunes . Can someone please from apple read this so they send me or us an update to fix this issue . its kind of a headache

[Re-Titled by Moderator]