It depends. If you use a low-sodium can of beans and the recipe requires some cooking liquid, it's okay to use it. It's very starchy and will help to thicken the soup.  In general, though, rinse the beans by pouring the contents of the can into a strainer, then rinse with cold water.  As always, use this recipe as a guideline and inspiration. Then adjust the flavors to your preference. Make it your own. You can do it!