Create a new site by going to Website > Create New Site. When you are finished, click "Create Site."
Enter a name for your site under "Site Name," your choice of a URL under "Site URL," and what kind of programs will be on this site under "Site Mode"
When you are finished, click "Create Site."
Your members' account logins will work on any site under your LeagueApps account. Members will have a separate profile on each site though. Their site profile is automatically created when they complete an action on a new site.