I took a pic with my device and I can't post it. How do I do this? Please explain in simple terms.

The first issue everyone seems to have is they don't upload the picture onto an Image Sharing Site.

Some image sharing websites are ...

imgur.com
photobucket.com

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Step 1 - Upload the picture to 1 of these sites, you'll have to make account or connect tot he site using your Facebook.

Step 2 - Once the picture is uploaded on the site you will be able to share the web address, also refereed to as the URL.
Copy and paste the URL to send it to a person.

Also, keep in mind you can usually google how to do these things for a better guide.
Here is a guide for how to upload onto imgur.com!

Guide Link

I'm going to add a little tidbit (And a name of a site not commonly known as I seem to be the only person I know who uses it)

Tinypic is another good image hosting site. I uploaded a lot of pictures there without creating an account for the longest time (Of course without an account there's nowhere to stash them unless you save the url). Though it started going weird on me at some point so I just made an account.

You can just post the link to direct people to the picture after it's uploaded, but if you want to post a picture, you can click the IMG button in the line of buttons to get this, but you need to put the link to the image in a code in order to show it. [*img*]Image URL here[*/img*] without the stars.