Dropbox allows you to access and update shared folder settings. Dropbox gives you two preferences to invite people i.e. 'Only team members' or 'Anyone'. You can allows your team members to invite more people. To access and update shared folder settings, Go to https://www.dropbox.com/ & sign in to your account. Select "Sharing" tab located at the sidebar on the left. Click "Options" link located at the right of the shared folder. Click "Change" to access the sharing preferences menu.