EDITING KEYS ON THE TRACK BAR

If you wanted to change the keys to adjust the timing you would do so by left clicking and dragging over them and then the left mouse button will allow you to move the selected keys.

You may pull that selected key wherever you wish from that point forward.  The further away you move the frames the slower the animation will be versus the closer they are the faster they will be. You can also highlight the keys similarly and then press delete to remove the keys.

Right click on the drop bar and you will be able to find your selection range.

And now you may alter the key frames en mass. And you may scale the keys by grabbing either handle on either side. Go to the left with this you may speed up that section of the animation and when you go right you may slow it down.

You may right click on a key and access the information of it, and if you go to the delete key you have access to the keys on that specific frame.

Now you may use the same technique above and see the specific information of a key. And you then have the ability to change the value and tension types.