No, we do not have dedicated coders for tasks like these.
Instead we encourage everyone using Wix Code to be (or become!) a coder 
Usually you can find an answer in Wix Code Resources . You’ve probably found your code snippet in the API Reference which describes the tools that are available to you (like wixUsers.register method). To get a better understanding of how these tools fit together check out our video tutorials and articles with step-by-step guides.
A quick search helped me locate an article which is more or less what you’re looking for: Velo Tutorial: Creating a Custom Registration Form with Code | Help Center | Wix.com
Try to adjust the example code according to your needs.
If something doesn’t work, you can always ask here in the forum or contact Wix Support .
Good luck!
Vytautas