Linking to a database can be tricky because, usually, you will NOT get the right results from opening the database yourself and then copying the URL from your browser's address bar. Instead, follow these steps:
Find the database in the library's A-Z Databases list, but do NOT click on it;
Right-click on the link to the database and select "Copy Shortcut" (or "Copy Link Location," or whatever variant your browser uses);
Then you can Paste that link anywhere. It will be STABLE and will work both ON-CAMPUS and OFF-CAMPUS.