You will need freezer paper (18in. wide, available in most supermarkets), a pair of scissors, and scotch or masking tape.

Open up the sides of the mold, and cut a piece of freezer paper that covers the mold in both directions, and Place the freezer paper shiny side up, and put a straight edge of the paper (not an edge you cut yourself) toward you.

Fold over each side so that it just fits inside the corder of the mold. Give each fold a good sharp crease.

While doing this, make sure your fold aligns with itself. This will insure right angles inside the mold.

Fold up the near side of the mold.

Create a crease on the inner edge. Go over this crease a couple of times to make it good and sharp.

Now bring up the other side of the mold and insert the nails to keep it together.

Crease the far edge just like the near edge, and the bottom of the lining should now be flat with no wrinkles.

Now take scissors and cut vertically about 2 inches from the end of the mold. Cut from the top of the paper down to even with the top of the mold. You are just making a cut, not cutting away any of the paper yet.

After doing this on each of the 4 corners, you can now fold down the long edge of the paper like so. Tape this to the outer edge of the mold; one piece of tape will do.

Do the same on the other side. Now it should look like this:

Give the mold a haircut and horizontally trim off all the excess paper on top.

We have arrived here.

Now: important step that should not be skipped! You are going to cut out a corner of paper from each of the 4 mold corners. Begin by cutting downward about an inch, starting about an inch from the end of the mold. You should only cut the inner piece of paper, not the paper closest to the wood.

Then cut across horizontally over to the vertical cut you just made.

This will cut out a rectangular piece of paper, which you can discard.

After doing this 4 times, it should look something like this:

Now it's folding time! Carefully lift up the paper. This is the part much like wrapping the end of a present, except inside-out.

The paper layers should fold relatively neatly. If they don't behave and create a big lump, try to straighten them out. Some small wrinkles are fine.

Fold it over the mold end and tape it on the outside to hold it. Wrinkles on top are not a problem.

Same thing at the other end!

Voila, you are done! When taking the soap out, you can just pull the paper off, but if you are careful you can probably reuse the same paper for 2 or 3 batches.