Not all societies appear in the drop-down list on the Society Member Access page as it depends on the type of access they have. All members should receive an email from Sage with specific instructions on how to activate their access.
However, if the society is not included in the drop-down list, go to your society website and log in to the members area there using your society membership credentials. You will find a link to the journal on this society website.
For any further assistance, please contact email@example.com.