On my user page I see a field "my logins":
When I click on it I can "add more logins ...", that brings me to https://tex.stackexchange.com/users/login?noauto=true&returlUrl=%2Fusers%2Fcurrent where I can add a StackExchange account.
Your question was posted using an unregistered account and was not connected to your registered one. Either your browser session of this question post expired or it is because you used two different email addresses.
Anyway, in such cases users should flag the question for moderator attention using the gray 'flag' link below it. You can then state there that ...