Registering your own copyright isn't hard to do but, depending on your circumstances, it might make sense to consult an experienced copyright attorney.
Patents, trademarks, and copyrights are all forms of intellectual property and just like any other property, intellectual property can be bought, sold, inherited, or otherwise transferred.
Whether you're just learning how to start a blog or you've already got a dedicated blog readership, you should know about copyrights and trademarks, so that your work will be protected.