TonyKa, to assist you we need an error details.
Please, open /ow_includes/config.php file and set DEBUG_MODE to true (https://docs.oxwall.org/plugin-tuts:enable-debug).
Then go to phpMyadmin and check whether the
ow_base_authorization_user_role table has a following default settings:
Provide us screenshot of these settings.
Reproduce your last action and if there are any PHP errors post the error message here.