I have moved your question to a new thread. Start by choosing one or more coin adapters, then proceed to install them.
Once you get this done, you can proceed to install some app extensions depending on what your needs are.
If you’re getting started, it is useful to check at least the glossary section of the manual.
Let me know if you get stuck somewhere or if you have questions.
EDIT: I noticed now that you’re asking about the Exchange extension. If you have followed the installation instructions you should have created one or more markets. Do you see the markets?
The markets will be empty at first, as explained on the extension’s homepage (see disclaimer about liquidity). This is as designed.