Below is the envelope I sent the story to myself in with the story still inside (I was told not to open it). The receipt from the postal place is used to cover up most of my address.
This method is known as the "poor man's copyright," and according to this link, it has proven ineffective. But even so, my mom said, it still works. Another post quoted in the blog points out that your work is copyrighted once you create it. But I've already mailed my story to myself, so what is done is done.
For the record, I've only received some feedback as of yet from those to whom I emailed the story. Though I understand it takes different people different amounts of time to read. Another person I'd sent it to is the bartender at my favorite local bar. I saw her two weeks ago at a neighborhood grocery store, and she said she'd begun to read my manuscript, but that she's a slow reader. Another I sent it to, a fellow bar patron was texting me about what she had read so far when she received the email.