Providing the username and password of your zotero.org forum account here allows you to sync Zotero libraries across multiple computers. This can be set to occur automatically, but can also be done manually by pressing the sync button in the main Zotero pane.

See Syncing for more information.

1. To configure your library for storage you will need to first upgrade to Zotero 2.0b7.
2. Open the Zotero Preferences pane and select the Sync tab
3. Set your file syncing preferences to sync using Zotero for your library

You can view your current usage and quota in your Storage Settings.

See File Syncing for more information.