This is how to change a clips playback frame rate from 25 frames per second to 23.976 (projects frame rate) – This assumes that you have a 23.976 project.
Go to the Animation clip and look at the motion
Go to Tools>Motion Effect Editor
click on Promote
Change to Duplicated Fields
Then you can change the fps here in this window
To make faster put in an amount higher than 100 percent ex: 140 percent will make the footage faster
Hit the play button to see the effect on the footage
Or to make slower put in an amount lower than 100 percent ex: 50 percent will make the footage slower
Next if you just want to change the frame rate to make 60 FPS footage 23.976 to slow it down.
If you have footage at the wrong frame rate like 25 fps
go to playback frame rate change to projects fps 23.976
Render at 10 bit
turn up the render settings