After following these steps I have now lost my admin section?

* almost fixed

The login screen stalls and takes me to this url:
http://xxxxxx.org/_devsite/Security/login#MemberLoginForm_LoginForm_tab

Im not able to access my admin section.

2. where does the javascript folder get copied too?
3. where does the blog folder get copied too?

The JS can go in 2 places - themes/yourtheme/javascript/* or you could put it in mysite/javascript/ I usually put it in the mysite/javascript but some people like to put it in the theme. It does really matter as SS doesnt do any dynamic loading or anything with JS - not like it does with CSS.

The modules (blog/forum etc) go in the root folder of your SS install eg same level as cms and sapphire

Im not sure adding members via phpmyadmin - you probably can but never done it so dont know how the encryption stuff works etc for the fields. What you could do is hard code a user account in your mysite/_config.php file by going

Security::setDefaultAdmin("user", "crazynewpassword");

Which creates a user with username 'user' and the password 'crazynewpassword'

Do you get any error messages when you add that? Or does it just die? can you check your PHP Error Logs for anything?