Hello Marko, I'm sorry you are having problems with your account.
Please try changing your password and then try to sign back in.
If you would like to sign in using Facebook, please try this:
- make sure both Pixoto and Facebook log in e-mails are the same
- make sure you are signed into Facebook
- log out of Pixoto
- chose Sign in
- then Sign in with Facebook
your Facebook should be connected to your Pixoto account.