Error Establishing Database Connection

This may be a weird situation but a friend asked me to install wordpress for her at the root of the test domain register.com and I was able to get into her dashboard and set up a database and FTP the wordpress files fine…but when I ran the install.php I got the typical database connection error. I’ve triple-checked the wp-config.php file and there are no errors. Not sure if this is due to the weird temp setup they give customers or what. Here is the temp

[Installation url moderated]