Yuny,
I think you're missing some steps. You need to tell us what exact steps you made.
You say:
1. You went to
www.asiajam.com
2. Then you clicked on 'bags'. You should arrive at:
http://www.asiajam.com/catalog/index.php/cPath/9
3. then you say, you go to,
http://www.asiajam.com/catalog/login.php , but how did you arrive at that page? What link did you click?
At bags, maybe you should 'add an item' to your shopping cart, then only login to buy or something.
Please be more specific so we can trail your steps to see where you got wrong.