
In the Software Update pane, there is a 'Check now...' button. click it to begin the process of finding the latest updates for your system.

This will open a new window that looks like the following with a list of things to update.

Go ahead and install the updates. The only update that I recommend NOT INSTALLING using Software Updates is any Mac OS X 10.x.x Update (where x is any number). I usually recommend going to the Apple downloads site and downloading the COMBO version of whatever Mac OS X update is required and then installing the update from the downloaded COMBO UPDATE file.
You can go directly to the Mac OS X Updates download by clicking here.






