Hi Wesley,
you can bulk-edit all your connections and change the password this way. To do so, click on the document node (tree root node) or a folder. In the connection list select more or even all connections (using shift click), go to edit -> properties. The bulk-edit dialog is now open. From there you can "override" specific sections (like credentials). Check "Override Credentials" and provide your new credentials. After clicking OK, all your selected connections will be updated with your new credentials.
Hope this helps.
cheers,
Stefan