Can only get navbar to display vertically

I am having trouble with nav bar only showing vertically and not horizontally, I have looked at a lot of videos and feedback from other posts. Now I feel like I have probably done more harm than good. Even when I try code that is working for other people and copy into codepen there’s does not show up horizontally either. There must be something I am doing wrong.
Here is what I have, It does collapse but it only shows vertically.


Sorry here is a link to the pin:

You are loading both Bootstrap3 and Bootstrap4. You should remove Bootstrap4 by clicking Settings -> CSS -> …bootstrap4…X. You should also remove the Bootstrap4 javascript.

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@Motardo, Thank you so much, I know I had to be doing something stupid but the more I tried to fix the more I was confused. Thanks so much.