Welcome, I am Cory.
I am sorry this has changed on you.
If you go to the inbox, on the Left you will see Folders.
If you hover the mouse to the right of the word folders then you will see a plus sign appear and you can then add a folder.
If you have any questions, please reply and I will assist you.
Please do not forget to rate my answer 3 stars or higher for helping you today.
Please let me know if you were able to find where to add a folder.