http://www.amibroker.com/members/library/detail.php?id=1510&hilite=SetPositionSize
Is the username password different. the current one doesn't allow entry.
Different to what?
Members area uses a username and password you receive when buying Amibroker. At least that’s how I got mine. It was sent in a second e-mail after my receipt.
Just login first to members area
http://www.amibroker.com/members/
using credentials received after purchase.
If you can login there, it will just work for AFL library as well.
Please note that anything regarding licensing should be discussed IN PRIVATE,
via direct email to support, not on public forum.