You've been given the answer on how to implement this interface in terms of declaring it in the class definition. You still have some work to do though as you have to actually implement the interface methods. Given that you have this to do, how could you get a head start? Well, one way - if you aren't familiar with C# - would be to use a C# to VB.NET (and vice versa) converter. It's a good way to get an understanding of some of the language constructs, even if it won't make you familiar in all their nuances overnight.
A fairly decent converter can be found
here[
^].