I installed panda3D and i can not find the .exe or the main application to open it, i am new to game development and i encountered the same issue when i installed another game engine
Greetings, and welcome to the forum! I hope that you find your time here to be positive! 
To answer your question, well… you don’t. Open Panda3D, that is. It’s not that sort of engine.
To be specific: Panda3D is the sort of engine that one is expected to incorporate into one’s programming.
There is no visual tool for development (as there is with an engine like Unity), or an executable to run, or anything like that.
So, to use it, you might set up your programming tools (e.g. an IDE–or even just a decent text-editing program, at least at the start), then, using the Python programming language (or C++), you would write a program that includes/imports Panda3D.
For an example of this, take a look at the manual’s “Hello World” tutorial:
https://docs.panda3d.org/1.10/python/introduction/tutorial/index
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If you’re more partial to video tutorials, here is one that could be a good introduction to Panda3D:
There are other video tutorial series on YouTube, such as the one by AtiByte, that have more content.
For a great and comprehensive text tutorial, you can check out this website:
Happy coding!
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