1. Open Finder.
2. Click Applications in the left-hand pane.
3. Now, double-click on the Visual Studio icon.

4. Now, click on Open, locate the Chapter8.Xamarin solution, and open it.
5. The Solution Explorer should look like this:

6. Now, control (^) + click on the Chapter8.Xamarin label and select Add | New Project.
7. In the New Project dialog box, scroll down the left-hand pane till you see the Multi Platform section.

8. Click on Library and select .NET Standard Library under General in the right-hand pane. Also make sure C# is selected:

9. Click Next.
10. Select Target Framework: as .NET Standard 2.0 and click Next:

11. In the Project Name: textbox, type Chapter8.Xamarin.iOSLib as the name and leave the rest:

12. Click Create.

13. Now, the Solution Explorer should look like this:

14. Select the Class1.cs label and press command + R to rename.
15. Rename it HelloLib.cs.
16. Make sure you change the class name as well from Class1 to HelloLib.
17. Now, inside the HelloLib class, add the following code:

      public string SayHello(string yourName)
      {
          return $"Hello {yourName}, Greetings from iOS";
      }

18. Click Build | Build All to check that all syntax is correct.