I think the picture of the K key with the arrow is just a symbol for “shortcut key”. They’ve gotten rid of that picture in Wavelab 9.
The shortcut for Record is * (asterisk)
Which should be good on your keypad numberpad.
Also, if you right-click in an open area of the transport bar, you’ll get a menu with a selection at the bottom called “Edit Shortcuts”, which lists all the shortcuts and allows you to change them.