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By default xi is configured to monitor itself, but it's probably a bit more useful if it monitors objects outside of itself. There are are a few ways to add hosts and services for xi to monitor, but one of the easiest ways is through xi's configuration wizards. Below is a video stepping though setting up xi to monitor a website.
Wizards are a good way to usually add just one host at a time, but other methods exist for adding multiple hosts to xi. These methods are a bit more involved so we'll point out these resources if you wish to delve deeper: