This actually is explained on the documentation page, if you want tutorials on MySql, how to use and build it i would suggest this site - http://www.mysqltutorial.org/
You don’t even really have to know MySql in depth, if you know how to import the database structure into the database you use and how to upload the PHP scripts to your server there’s nothing else to it.
Above this, i really would suggest to all people that want to use this kit to first get familiar with the absolute basic stuff you really need to know if you want to develop a game and especially a MMO on the Unreal Engine or whatever engine you want to use for it.
This isn’t a click and build toolbox where everything is done for you automagically with one push on a button and at least some programming experience ( especially blueprints if you want to adapt some of the blueprints to your own specific needs, and you will ) is needed because this kit sets up the basic needs to build you own MMO upon and the rest is up to you.
This is a very solid base and flexible enough to totally tailor it to your needs. And is extremely helpful and friendly in his support but i really would suggest to do some research yourself, like the link i just gave here was 2 seconds of work and i don’t think it’s up to to make ( video ) tutorials for the most basic stuff you can find out easily for yourself. You don’t have to be a PHP / MySql expert to set up the database.
And even though i believe actually is prepared to hold everybody’s hand and lead you personally through the whole process this is impossible for him to do.
Good luck.