Keyframing is done using the effects controls at the top left window. In order to make a clip animate, keyframes would need to be set for a beginning and end value, be it for position, scaling, rotation, or other properties.

For a tutorial on how to use keyframes, click the Lynda playlist below.

Lynda Playlist: DLL Adobe Premiere Keyframing:

https://www.lynda.com/SharedPlaylist/e1952f49cfb946e7a90f17dee303a326