I had the same problem with “Can’t select database” as well….
Turns out, I had to figure out how to get into my MySQL control panel….also known as cpanel.
I contacted my hosting provider (webhostgiant) through online tech support and they gave me the special URL I needed to get into my cpanel.
Once there, I created a database in the MySQL database. And just like other users on this forum have noted, it created a naming structure by default that was
username_dbname
Once I did that, everything worked perfectly.
