There are code samples in our documentation that demonstrate how to invoke browser specific actions or use multiple browser instances as well as a more general user guide for the framework, please see:
Multi-Browser Instance Support
Using Telerik Testing Framework
Automating Browser Actions
Also note that your installation of the Telerik Testing Framework comes with a large amount of unit test samples, by default they would be installed under:
'...\Telerik\Test Studio\Samples\Testing Framework\'