I created an Add-in project and now I have this in my solution explorer:

Do I just add right click the solution and add a Windows form? I’m not sure how this works and the tutorials I find don’t touch on this.
Thanks.
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You can right click the project file under the solution file and select add new item. Btw it looks like you have a missing reference for “Microsoft.CSharp though; that will need to be resolved or removed from your project.
Here is how you instantiate a form and show it in the most basic sense.
Hope this helps.
Enjoy!