Hmm
To fill a hole you need one to fill. So maybe you don't have a hole??
To have a hole you need a closed polygon. Anything over two sides. But the sides must be joined.
Best way to do it is to gos step by step.
In point edit mode select the 'add edge' button.
While holding down the SHIFT key draw a line.
Let go the shift key.
select the last vertices /point/dot thingy on the line you drew and it will go white
While you have the cursor on this verticie left click and drag.
You will now have another line.
Repeat the process but this time draw the line back to the open end of the 'polygon'.
Make sure the pointer hovers over the vertice.
The verticie will turn red.
Let the mouse button go.
Chose e dge select in the menu (there are three buttons, one is a dot, the next one is a diagonal line, the third one is a filled triangle. Chose the diagonal line. This is 'edge select'.
Click on drag select (the broken lined rectangle.
Select all the lines you drew.
They will turn white.
Hit shift j.
this will fill in your face.
well the face on the anim8or screen anyways
See mp3d tutorials.
Or see animanon.com for a teacher. Ask for kevin kreator.