Right-click on message header in message list (Inbox), select Tag, and
do what's needed.
Dragging a message header is equivalnet to Move. If you want to see the
message header in the Inbox, use Copy: right-click on header, select
Copy To, you'll get a list of possible locations, click on the one you want.
BTW, when you create a folder, make sure it's under the account name and
not under the Inbox.
HTH
--
Best,
Wolf K.
kirkwood40.blogspot.ca