On the website
http://blockchain.info, I am able to create multiple addresses. I was wondering, when sending money, why it does not appear in the list. How do I get it to appear in the list and allow me to send bitcoins?\
You can only send bitcoins from addresses that already contain bitcoins.
If you create a new address it has no bitcoins associated with it.
If you want to use the new address you need to first send bitcoins to that address.