Bandsaw breaks blades

Each bandsaw is a little different but a good quality one will let you adjust tension, adjust some guides for centering the blade and keeping it aligned, and adjust the "throat" (the space between the guides where you will actually be cutting the part) You want to have the throat be as small as possible to get your job done, and your guides tight but without touching the blade (good general rule of thumb would be to place a business card on either end of the blade and butt the guides up against the business cards. Are the guides static or are they bearings?
Another important factor is if you are running coolant on it or at bare minimum some bandsaw wax (I really like Lennox brand)
Some pics can help give more help as well.

PS. Are you running the correct blade for your material? Another general rule of thumb is the softer your material then the less teeth per inch you need, and the harder the material, then more TPI