PHP-posix module

Ho installato in una cartella del mio account in CMS , dopo aver cliccato sul file install.php, mi compare una pagina con 5 indicazioni.

Prerequisites to Running This Script:
1. ⨂ allow_url_fopen is currently set to 'Off'. Your PHP configuration must have allow_url_fopen set to "On".
[NON SO COSA SIGNIFICHI]

2. PHP-pspell module is not installed or enabled. It's recommended to install/enable the PHP-pspell module in order for the search spell checker to work, but not required.

[dovrebbe essere installato dall'admin di Altervista]
3. ⨂ Warning: PHP-posix module is not installed or enabled. Installation cannot proceed. Please, enable it and try again.
[idem: dovrebbe essere installato dall'admin di Altervista]

4. Before proceeding, you must change permissions (chmod) to the following directories and files:

Chmod the following folders to 777:
Chmod the following files to 666:

[tutto verde, quindi non ci sono errori riguardo l'autorizzazione]

5. Be sure to create a MySQL Database and User before proceeding:

Site and Database Details:
Document Root: /var/www/html
Base Directory: /var/www/html
MySQL Hostname: localhost
MySQL Database: my_username
MySQL Username: username
MySQL Password:
Site Name: MYSITE
Administrator E-mail: info@altervista.org

[Cosa manca riguardo il database?]
Grazie