How find my access code

Hi. I wrote last week-end.  I had a problem for give the answer. I'm sorry. Ok, i have a problem with my connexion.  I open my mask and open my session. I see to username.  When i connect my session they ask me my access code (code d'accès). It's the first time they ask me my a code to open my session. When i try to open  wife's session  i have access to his account. It's really strange. I don't understand. How can i find my access code.

[edited for privacy - this is a public forum]