From 'welcome page' of database center choose 'anonimous login' to see list of databases available:

select a database of your interest and press 'continue' button to see available datafields of this database:

You may either browse all the database content (RETRIEVE ALL) or search for specific structure (substructure) or search for other fields data, like molecular weight or brutto formulae, etc.:

If you choose 'RETRIEVE ALL' radio button server responce contains all database content, and you may browse structures/data moving from record to record using navigation buttons:

Use checkbox "Hit" to bookmark interesting database entries and "download list' button to get list of selected entries.

To search for specific structure choose "Structure' in field name coloumn and press 'continue' - an applet window appears (this may take few seconds), where you may draw substructure: