Where are the Extend Buttons?

Support Basics & Interface
1

Research on the web has revealed http://download.blender.org/documentation/html/x4506.html, which details a solution to my problem with IPO Extension. But when I select the IPO curve in the IPO Window, those four buttons to Extend the selection do not appear. Only the Up and Down arrows (Paste Into & Paste From The Buffer) exist.

What is wrong? Do I need to be in a specific Mode (Object/Edit/Pose?) for them to operate?

Thank you, Bob

2

they aren’t actually buttons, theyr’e in the “curve” menu, in the “extend mode” submenu.
that documentation is evidently for an older version of blender… try here