To get a good look at the saw, you need to remove the two nuts that hold on the sprocket cover (left side of the motor). Once you have pulled that off, you can properly align the bar and chain. You may need to de-tension the chain to get it to fit on the bar and sprockets. Put the side back on but don't tighten it all the way. Adjust the chain tension, then fully tighten the sprocket cover. Double check chain tension, You should just be able to see the bottom of the chain guides as you pull the chain away from the bar. If you see a whole line of them, tighten tension, if it is stiff, loosen chain tenaion. You must always loosen the sprocket cover just a bit when tensioning the chain.
Be sure you have chain oil and follow gasoline mix directions. Always use premium unleaded gas and 2-cycle oil (premium cleans better and holds octane longer). Be careful but have fun.
Let me know when you are ready to move up to a 36" bar and take out some real timber!