Error occurs after uploading my website on a free web hosting

I get the following error when accessing to the database (regdb) created on free web hosting www.biz.nf.

Access denied for user 'regdb'@'83.125.22.210' (using password: YES)

The website perfectly works on my computer using a localhost (through Xampp server). However, after importing my database to biz.nf I got that error :(

Has anyone faced such a error before? Thank you.