localhost is no URL, it's a common standard name for every machine's internal communication channel - in this case necessary for OSSN to connect to the database.
Simply enter the word localhost here.

New error:
(using password: YES)

@Arsalan Shah
my hosting provider, HostGator tells me to write Localhost, but the problem capacity continues.
In your case you wrote in that box?

link image: https://gyazo.com/38949d5c2df6e2b1feaab08524e7eb9d

@Felix alejandro, please don't use abusive language over here. That error mean the database host you entered is incorrect. Its usually localhost or leave it blank. If it still didn't work contact your hosting provider to find correct database host.

@Zet Man
thanks, as I understood, but now do not know why this error shows me shit.

> WTF, name correct database, user right, correct password, you fuckin
> get this error?

Image link: https://gyazo.com/fdf745d2d015b9dfcd52bd41ca0d0bb9

@Felix
Read
https://www.opensource-socialnetwork.org/wiki/view/706/how-to-install-open-source-social-network

Hello.
I do not quite understand what they mean. Even I can not fix the problem.

My site URL is: http://valenetwork.com/facebuk/
My Data Directory is: /home3/felix22/valenetwork.com/ossn_data/

as it should be?

yes thanks got it to work :) thanks for all the kind help
cheers

Yes,
1.) you have to create a directory "ossn_data" by yourself with your FTP utility or your provider's filemanager.
2.) make sure, this directory is created outside of your OSSN installation (you called it "root domain")

thanks but i am trying to install in root of the domain but it cant write to this dir ossndata cause it is not there do i make a dir called ossndata ?
thanks for superfast reply