I have successfully installed the Bochs app but I cannot get it to work since it automatically shuts down. What should I do and how can I boot the device?
What you experience is often called a crash. Although the software installs just fine, something prevents it from running, therefore you will have to post on the XDA Forums where software is hosted. The developers will give you additional instructions.
I've checked the thread and it seems there is support and activity available.