Hi
With version 2.41.
Drag and drop your clip to the sequence line (or add it via the media list).
Right click the clip...It will turn blue meaning it is selected, and a list will appear.
Select (Left click) "Adjust effects"...This will open the Effects Library. (or you can select from the "Effects" tab at the top of the media list window)
In the Effects Library window Left click the "Speed" Option
Now use the slider to get 30% in the speed window.
Once the green status line has run along the sequence, your selected clip will play about the correct speed.
Nat