Hi Megan. Welcome to #steemit. Probably you have a lot of question about Steemit and the easiest way to get proper answer is from reading the https://steemit.com/faq.html

Remember to give credit back of the images you taken from. The human verification with username is just an option. Meanwhile, main password is extremely important and remember to keep it in a safe place and do not lost it. If you lost it, you can never recover your account.

Have fun exploring and posting your experiences in Steemit. Enjoy!