You can rename it from that window. Just click on the name at the top of the box (there may be an arrow on the right hand side). It will open up and you can change from there.
I got my Macbook Pro a little over a year ago. The learning curve was steep (ha- have you figured out spellcheck? That took me forever!!) but I love it now. Plus you can google any of your questions and the help sites are numerous.
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