Ah, that is not how this works ;)
There is no session, and no logon. your identity is represented by a private key that is stored in on your computer.
In ordinary websites, the server is the guardian of your identity,
and grants it to you. This is the reverse, you are your own guardian.
When you make a post, it creates a signed record, that appends to a history of things you have done. When my computer sees your messages,
it knows it's, well, actually it doesn't know who you are, but it knows you are the same identity as before.