HI
In version 3.29.
First of all load the clip to the Media list and then drag and drop (or place) the clip onto the sequence track.
Right click the clip to select it
Click the video effects tab on the tool bar and then the "Add Effects" tab.
Select the "Opacity" effect from the list
Your clip will now preview in the effects window with an Opacity% slider on the left and a keyframe box to the right with a blue line representing the opacity and a red cursor line.
For a simple fade in....
Set the cursor line to the left of the box by dragging the blob at the top of the line. (The movement is reproduced in the preview pane)
Now drag the slider to the left to show 0% opacity.
Click the green cross to set the first keyframe; an orange square will appear on the blue line.
Now drag the cursor along to the left a suitable distance for your fade in. The orange square will go green.
Slide the opacity cursor to the right now to show 100% opacity and fix a second keyframe by clicking the green cross again.
You can repeat (or start) this procedure anywhere along the clip with as many opacity changes as you wish. You don't have to start at begining of your clip as described here. A fade out at the end is the reverse of a fade in....opacity starts at 100% and reduces 0% at the end of the clip. You use the red cursor bar to specify where your opacity effect is to start or finish and the slider to determine the degree of opacity.
You can also directy drag and drop the keyframe blocks onto the blue line as and where you wish. Simply right click the line to create a keyframe point and drag it to where you want.
VP will update the sequence line as you work and on closing the effects window the sequence green bar will complete the registering of the efeect.
The image that appears at the end is, apparently, a bug. I haven't checked but it may have been fixed in version 3.29
Nat