1) For testing purposes you can use every site that is publicly accessible. For example:
2) Looking the provided coded step, I can tell you are testing a custom TextBox control(SearchBoxExtendedtextbox) and this is the reason you are not able to find the Text verification in the Quick Tasks menu. To get the text content from a custom control, you need to use the Text property into a coded step. Please check this video demonstrating how to do that.
the Telerik team