+If you encounter a blank (white) page when using the application, view the PHP logs - as this almost always indicates an error has occurred.
+
+## Diagnostics
+
+In this section of the admin panel you find two tools to investigate what Friendica sees for certain ressources.
+These tools can help to clarify communication problems.
+
+For the *probe address* Friendica will display information for the address provided.
+
+With the second tool *check webfinger* you can request information about the thing identified by a webfinger (`someone@example.com`).
+
+# Exceptions to the rule
+
+There are four exceptions to the rule, that all the config will be read from the data base.
+These are the data base settings, the admin account settings, the path of PHP and information about an eventual installation of the node in a sub-directory of the (sub)domain.
+
+## DB Settings
+
+With the following settings, you specify the data base server, the username and passwort for Friendica and the database to use.
+
+ $db_host = 'your.db.host';
+ $db_user = 'db_username';
+ $db_pass = 'db_password';
+ $db_data = 'database_name';
+
+## Admin users
+
+You can set one, or more, accounts to be *Admin*.
+By default this will be the one account you create during the installation process.
+But you can expand the list of email addresses by any used email address you want.
+Registration of new accounts with a listed email address is not possible.
+
+ $a->config['admin_email'] = 'you@example.com, buddy@example.com';
+
+## PHP Path
+
+Some of Friendicas processes are running in the background.
+For this you need to specify the path to the PHP binary to be used.
+
+ $a->config['php_path'] = '{{$phpath}}';
+
+## Subdirectory configuration
+
+It is possible to install Friendica into a subdirectory of your webserver.
+We strongly discurage you from doing so, as this will break federation to other networks (e.g. Diaspora, GNU Socia, Hubzilla)
+Say you have a subdirectory for tests and put Friendica into a further subdirectory, the config would be:
+
+ $a->path = 'tests/friendica';
+
+## Other exceptions
+
+Furthermore there are some experimental settings, you can read-up in the [Config values that can only be set in .htconfig.php](help/htconfig) section of the documentation.
+