I used that thread because that is the only place I have seen mention of a pull down menu for multiple callings.... I don't care where my post goes, I just want to find the pull down menu.
Is your username the same one you use to Sign in to Clerk Resources? I only see 1 calling for you that is supported in Clerk Resources. PM me for further discussion about your account.
There is some delay between when a calling is added in CDOL and when it becomes "live" for login via our system that handles authentication / authorization. I just checked again, and it should be available now. PM me if you have any other problems.