Hi there and welcome
It does not have a password ***** default, so someone has set this, new there is never a password, it should have taken you through the setup menu.
We will have to reset the Tablet then its returned to new and you can set it up from scratch.
To do this, Turn off the Tablet then turn on the tablet the power button and as soon as the logo show up hold the menu button... this will boot into the recovery menu.
Then select Factory Reset and it will reset and you can use the Tablet like new and set it up.
Let me know the results please.