Amal,
Before you use the library's databases, you need to sign into the extranet. That way, when you try to access databases such as JSTOR that you just tried, you will not be required for login anymore. Please let us know if you continue to have the same challenge since the same database is working properly when using on-Campus access.
You can also let us know what topic you are searching for to enable us to suggest other available resources.
Regards.