CSPL stands for cursor, segment, punch and loop. Depending on which one is selected you can set either the position of the cursor or start\end points for the other three. Having said that, the CSPL buttons aren’t there in the latest full version of Podium – I’m not sure if they were removed and the guide hasn’t been updated? However, you can right-click on the timeline for the same options in a pop-up (context) menu.