How to connect the database on a Synology Diskstation

I have a synology disk station running dsm6.
on it is a webserver which is running invoiceplane,
I am able to access the setup page from my browser and can get to the screen that asks for the host name, user name, password and database name.

I have on the synology running mariadb and phpmy admin.
I have created a new database and have checked from phpmyadmin the stats so i can see it is up and running.

When I enter the database name into the database name field it says it cannot find the database.
I have done much searching, pretty much a day in fact, on this site, the wiki you tube google, and have not managed to get anywhere.

I know very little about databases and need some help.
Please can someone reach out.
you can find me on hangouts
asidscript@gmail.com

For the mySQL installation, did you follow any instruction? I can see there is one on Synology website but not sure if it may help

https://www.synology.com/en-global/knowledgebase/DSM/tutorial/Application/How_to_manage_MySQL_databases_on_your_Synology_NAS_with_phpMyAdmin

Other than that, IP or account permission may be the issue, have you checked that all good?