There are few ways to do that.
- You can make use of htaccess file. Refer to this article as a tutorial and you should have the idea what to do.
I am not very good at htaccess. But I guess for your case, you should write:
Redirect /index.html /PHPBB3/
- Alternatively, you can edit the home folder of a domain via DH panel --> Domains --> Manage Domains --> Web Hosting --> Edit --> Specify your web directory. For your case, you should change it to /home/username/domainname/PHPBB3
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