Fix wrong Postgres setup instructions in INSTALL

INSTALL

@@ -1,3 +1,11 @@
+INTRODUCTION
+============
+
+This file describes the basic steps to install RoundCube Webmail on your
+web server. For additional information, please also consult the project's
+wiki page at
+     
+     http://trac.roundcube.net/wiki
 
 REQUIREMENTS
 ============
@@ -84,19 +92,19 @@ webserver can write to the file.
 
 * PostgreSQL
 ------------
-To use RoundCube with PostgreSQL support you have to follow the next
-simple steps, which have to be done with the postgres system user (or
+To use RoundCube with PostgreSQL support you have to follow these
+simple steps, which have to be done as the postgres system user (or
 which ever is the database superuser):
 
-$ createuser roundcubemail
-$ createdb -O roundcubemail roundcubemail
+$ createuser roundcube
+$ createdb -O roundcube roundcubemail
 $ psql roundcubemail
 
 roundcubemail =# ALTER USER roundcube WITH PASSWORD 'the_new_password';
-roundcubemail =# \c - roundcubemail
+roundcubemail =# \c - roundcube
 roundcubemail => \i SQL/postgres.initial.sql
 
-All this has been tested with PostgreSQL 8.0.x and 7.4.x. Older
+All this has been tested with PostgreSQL 8.x and 7.4.x. Older
 versions don't have a -O option for the createdb, so if you are
 using that version you'll have to change ownership of the DB later.
 
@@ -104,8 +112,9 @@ using that version you'll have to change ownership of the DB later.
 CONFIGURATION
 =============
 
-Change the files in config/* according your to environment and your needs.
-Details about the config paramaters can be found in the config files.
+First of all, rename the files config/*.inc.php.dist to config/*.inc.php.
+You can then change these files according to your environment and your needs.
+Details about the config parameters can be found in the config files.
 
 You can also modify the default .htaccess file. This is necessary to
 increase the allowed size of file attachments, for example: