Use the following formula (in Points for Playing on the Game tab):
switch(r, 1, 100, 2, 75, 3, 60, 4, 50, 5, 40, 6, 30, 7, 20, 8, 10, 9, 7, 5)
You can insert the player rankings into your own layout by using the <rankings> token. Edit the cell in which you wish to place the rankings, press the "Insert Token" button, then select the "rankings" token and set the various options you want.
Or, you can just use the built-in screen "Player Rankings". You can display it by pressing F3, or by pressing the "Player Rankings" button at the top of the Settings window. You can modify how this screen looks by right-clicking on the Player Rankings screen and selecting "Player Rankings Properties", or by pressing the "Other Properties" button on the Layout tab of the Settings window.
If you modify a cell or the Player Rankings properties, you'll want to save your Layout (on the Layout tab) so you don't have to make those changes again for a future tournament.