Is there a setting to set the number of threads in LT? I did not see any. Is there a default it uses? thx
You configure this in the scenario in your Load Test project configuration. So, first click the name of your scenario. Next, select "Number of Users" in the combo box for "Controlled Parameter". At this point you can click and drag and drop in this graph to configure the number of users over time. You can click the "More/Less points" buttons to add/remove change points in the graph needed. You can also click the "Details Table" tab and double-click a cell to type in the number of users you want for each point you previously added in the graph.
There is a lot of customization available. For details, see Customizing Load Test Parameters.