Up: Help-M
Congratulations! This is the node `Help-FOO'. It has an `Up' pointer `Help-M', the node you just came from via the m command. This is the usual convention—the nodes you reach from a menu have `Up' nodes that lead back to the menu. Menus move Down in the tree, and `Up' moves Up. `Previous', on the other hand, is usually used to “stay on the same level but go backwards”.
You can go back to the node `Help-M' by typing the command
u for “Up” (the Emacs command run by u is
Info-up). That puts you at the front of the node—to
get back to where you were reading you have to type some <SPC>s.
(Some Info readers, such as the one built into Emacs, put you at the
same place where you were reading in `Help-M'.)
Another way to go Up is to click Mouse-2 on the `Up' pointer shown in the header line (provided that you have a mouse).
>> Now type u to move back up to `Help-M'.