Change button link based on two inputs (what if/else)

To achieve your aim without any coding-skills, this will be almost impossible.

Please take a look onto the VELO-API-references how to use all the given elements and APIs by Velo…

https://www.wix.com/velo/reference/$w/radiobuttongroup

https://www.wix.com/velo/reference/$w/dropdown

And here some simple example for you…
https://russian-dima.wixsite.com/meinewebsite/website-navigation