Open the world menu. (Left click the world in ordinary Squeak or press Alt+Shift+W if you are using The Web Browser Plugin).
Choose option open ...
Choose option Package Loader
If you are opening Package Loader first time in your image, it may take some time while the installation procedure ends and you finaly see the window similar to one which is shown below.
You should see three panes in the SM Package Loader.
1. The LOWER-LEFT (big) pane shows the complete list of all available packages.
Right clicking this page opens a menu:
If you want to install a selected package, utilize the "install" menu item.
Notice the checkboxes in the menu. If you want to see the packages which were not yet installed and can be installed, let them in their initial state.
2. The UPPER-LEFT pane can be used for quick search for packages
3. The RIGHT pane shows detailed information about a selected package
If you want to use a more full-featured SqueakMap package browser, try installing the "SqueakMap Browser" package.