Bulk loading data into Virtuoso database

Question

I am new to Virtuoso and I want to bulk load data (some .ttl files placed in a directory) into Virtuoso, so I can perform SPARQL queries on the graph. So far, I am confused with the process. Here's what I found:

1. define the data directory in Virtuoso.ini

2. run this script in iSQL:

   ld_dir("path_name",'*.*'graph_name);
   rdf_loader_run();
   

However, I don't know how to define my directory in Virtuoso.ini or if I need to do anything else since the doc is very confusing. If we assume that my file is in this directory: E:\git\Virtuoso Data\ttls How do I bulk load the files (how to define the path in Virtuoso.ini,...)?