adding and removing keyframes

Hello all,

I am just starting to grapple blender’s animation tools. I understand that pressing I inserts the keyframe on blender’s timeline. how do you go about removing that keyframe or for that matter, repositioning the keyframe.

Remove keyframe shortcut is Alt + I

But you have more control in the IPO editor.

If I have more control in the IPO Editor, how do I extend the length of the animation?

under the ANIM button you have start and end frame. edit those.
You can also change it in the timeline window.