Tempo changes can be added at any division up to 256 tempo changes per 4/4 measure. See Selecting a grid division.
To show tempo markers right-click on the Controller panel then select Tempo View from the menu.
Controller panel - Right click menu:
Create new tempo marker
To create a new tempo marker right-click on the Controller panel then select New Tempo Marker from the menu. Your cursor will change to a pushpin.
To place the tempo marker left-click on the Controller panel at the division where you want to place it.
To change tempo left-click then drag the marker up or down.
You can also double-click the tempo column on the left panel to change a tempo.
Press the "Esc" Key to cancel a new tempo marker.
Tempo markers are also displayed on the Time ruler in teal.
Free tempo markers
When enabled you can freely move tempo markers to any division line. Left-click then drag to move a marker to another division. Tempo markers will Snap to the grid division that is set on the Quantize toolbar.
Delete Tempo Marker
To delete a tempo marker, right-click on the marker then select Delete Tempo Marker.