WordPress is a free and open-source content management system that allows you to easily create a blog or website. Here are the steps to install WordPress on QTS 5.0.
- Open the Control Panel.
- Go to Applications > Web Server.
- Check Enable Web Server.

- Go to the App Center.
- Search for and install Container Station.

- Search for and install WordPress.

- Open WordPress.
- Follow the on-screen prompts to configure your WordPress:
- Select a language.
- Click Continue.

- Enter a Site Title, Username, Password, and Email. It is also recommended to check Discourage search engines from indexing this site.
Important: The Username and Password should not be the same as your NAS User name and Password. - Click Install WordPress

- Once installed, you will be prompted to log in to WordPress using the Username and Password.

- You can now use WordPress on your NAS.
Source :
https://www.qnap.com/en/how-to/tutorial/article/how-to-install-wordpress-on-qts-5-0