To set Frames per second follow the steps
1) Go to the Canvas menu, click on Properties
2)Properties dialogue boxwill open, then click on the Time tab
3) Go to Frames per second field type number for frame per second as per need (by default it is 24)
or click on the+ button to increase frame per second and click on the - button to decrease frame per second
4) Then click on the Apply button
5) Then click on the OK button