Run CoDebugger 

If you download the .zip file, you will see the following file structure after decompression. Launch CoDebugger by double-clicking CoDebugger.exe.

You will see a welcome page as the figure shows below after successful launching.

Colink or CoLinkEx is nessary and you can either implement it by yourself (See How to DIY) or buy a Colink / buy a CoLinkEx from CooCox.
Use Colink or CoLinkEx as a bridge between your pc and target board .
Before you use Colink or CoLinkEx, you need install Colink driver or CoLinkEx driver first.

Here we start to import a CoBuilder Project to debug.

1. Click Device Dropdownlist to select Device accroding to your project. 2. Click CoBuilder Project radio button to select a CoBuilder Project. 3. Click Browser... to select project root directory (recommend) to import one project or select a random directory. 4. Select the project you want to debug. 5. Click Debug configurations… to modify the default configuration or click Debug directly to start debugging. 6. Now you can start your debugging journey.