After you drag a widget out of the Widgets Library and onto a page, you'll see a blue arrow icon appear in the top right corner of the widget, when the widget is selected. Click this blue arrow icon to open the Options menu.
Each widget has different options available, so the options you can set in the interface of the Options menu vary. The settings control the behavior of the widget (such as choosing whether a slideshow will auto play or whether visitors must click the thumbnails to see each larger image) and the display of the widget (such as specifying the type of transition that will animate as each new image is displayed).
As you design websites, you'll have an opportunity to make these settings and work with your clients to find the best choices for a specific project. Remember that at any time, even once a site has been published online, you can return to the .muse file, select a widget, click its blue arrow icon to access the Options menu, and make new settings to change the widget. Later, after you publish the site again, the changes you make are reflected on the live website.
With Menu widgets, you can have the widgets dynamically display the page names of the site and automatically create the links to those pages. This makes it very easy to add site navigation to pages based on your sitemap in Plan view, and you never have to worry about creating broken links. You can also disable specific pages so that they do not appear dynamically in the Menu widgets by right-clicking the page's thumbnail in Plan view and deselecting the option Include page in Navigation. This option is enabled by default (and displays a checkmark when it is enabled).
Alternatively, you can also choose to set up Menu widgets manually, if you would prefer to name the buttons yourself and add the links to specific pages, rather than allowing Muse to create the menu items. In the Options menu, in the section named Menu Type, you can choose the Manual option.