Not sure exactly which model you've got, but Husquvarna has their manuals here. Punch your model number in and you can pull a user manual that will give you the exact details on your chainsaw.

Don't forget that as you use a chain it gets longer, so you have to keep adjusting the chain tension. A new chain needs to get adjusted constantly during the "break in" period or it will fall off.

Hope this helps, if so, please vote. Thanks!