How to Resize a Soap Recipe Video

Do you have a soap recipe that is either too big or too small for a mold you may have?  And you do not know how to resize it to make it fit?  I found a video from Lovin' Soap called How to Resize o Soap Recipe..  I have not viewed this video yet because I did have a recipe that I needed adjusting. But I plan to view it soon.  So I can learn how to do so.