I can't excute software project in visual studio, C#

Question

I'm learning software developer and got this project of git hub to learn. https://github.com/the-best-flash/CSharpMiner

The project's creator give us the follow instructions to execute this project in visual studio, but I don't understand the step number 2, (Change the dropdown that says "Debug" to say "Release")

*project's instructions :

1. Load the solution file. *.sln
2. Change the dropdown that says "Debug" to say "Release"
3. Select "Build -> Build Solution"
4. Navigate to the CSharpMinerProgram\bin\Release folder and copy the.exe, and.dll files to wherever you want to run the program from. (ex. C:\CSMiner)
5. Make a \bin folder wherever you put the.exe (ex. C:\CSMiner\bin)
6. Copy the.dll files from CSharpMinerProgram\bin\Release\bin to the \bin folder you just made.
7. Create a "config.conf" file in the same folder as the.exe (ex. C:\CSMiner\bin) you can follow the example further down.
8. Right click on the.exe and make a shortcut. Copy the shortcut to your desktop.*

I tried follow the project's instructions but appear this error:

Answer 1

Class Libraries are not executable program.

You should right click CSahrpMinerProgram and select "Set as Startup Project"

Answer 2

When i cloned and opened it up, the wrong project was selected as the startup project.

Click this