As little as possible and as much as necessary is the key! Following are tips on using specific search options. It is probably unnecessary to fill in more than two options to find what you are looking for.

Subject	This is the title of the sermon (if there is one). Entering any word in the title will bring up all sermons on that subject eg entering Jesus, will find lots of sermons. Click on Next» to see them all.
Book	The book in the Bible that the Sermon is based on. It is recommended that you search only for the book and possibly the chapter but not specific verses eg Matthew 1. Matt will find all sermons based on Matthew but Matt 1 won't work.
Date	Enter the Sunday's date you are looking for. There isn't always a sermon for every Sunday, for various reasons. Note the stupid date format ie YYYY-MM-DD. Sorry!
Morning/ Evening	Handy when looking for a series of sermons eg entering Revelation under book and clicking the Evening button will bring up that series.
Notes	Sermons are sorted by date – the most recent first. Sermons open in Adobe Acrobat and are all 100kb in size. Click the Acrobat icon to get the sermon you are looking for.