Change speed of clip gradually

[Haugen]

I have a clip I want to gradually speed up, but I don't know how. I know about time stretch, but I don't see any ways to add keyframes. So, how can I gradually speed up the clip form 100% to 600%?

[dj.summitt]

Select the layer. Press Control + Alt + T to enable Time Remapping. Now you can keyframe the results. 

[Haugen]

Thanks! But that was not easy! Any tips on how to get it right?