Synology - Projeqtor

Hello All,
I'm new in the forum, so first of all thanks to all of the contributors, and I say hi to everyone. I would like to install and customise projector for our oranisation, I think that it is very adapted to the management of our projects.

I'm coming back to the post, as I'm trying to install it on a synology server. I have a projector database created in phpmyadmin.

I have 1 question : what is the use of step 4 : creating virtual hosts?

And I have an issue, I get the following message : SQLSTATE[HY000] [1045] Access denied for user 'xxxxx'@'localhost' (using password: YES)
dsn = mysql:host=127.0.0.1;port=3306

How can I solve this?

Thank you Babinus
I have resolved almost all the issues in the definition of parameters. I'm only left with a problem to rights to write the log files. I have tried every possible thing to solve that. I'm accessing to database with the same ID and password as my own access to the server. Any hints?
what is the identity that asks the system to write the log file? Should I create a specific Identity on the server and award it read/write rights?

You must set apache user as owner on directory.

Thank you Richard,
I gave read/write rights to the http user and it works.
I am now facing a new issue. When I access to the application for the first time, the admin/admin default access does not work. Do you know what could the the problem?
Any advice on how to proceed?