"What if I make a mistake in my post because I didn't spell check or something?"

Thankfully, it's very easy to edit a post you've made!

At the Dashboard on the left side under Posts, you'll see an option, highlighted in the picture, to Edit your post.

Go ahead and click on that.

PLEASE NOTE THAT THESE IMAGES ARE ALL SCREENSHOTS

And you're brought to this screen. You can only edit your own posts. You will see the posts you've written in blue. The ones someone else wrote are in black.

Click on Edit on your post.

And you'll be brought back to this screen.

It looks just like the other screen, except what you've written is already there.

From there, it's a simple matter of adding or subtracting copy.

You can edit the headline, bodycopy or Tags.

Once you're done, click on the blue Update Post button on the right.
Once you've done that, you'll be showed a confirmation bar in yellow towards the top of your screen. Click on Go Back.
...and you're brought back to the screen we were at initially. Find your post you just edited and click on View

And it'll bring you to the published post, complete with edits!

How simple!