Action Details
Requirements and how-to articles for Nintendo's action:

When your game nears completion, you can start preparations for the release of your game: sign a publishing agreement, obtain an age rating, and submit your game for review by Nintendo.

You need this to get it done:

Sign Publishing Agreement
Sign a publishing agreement with Nintendo.
Obtain Age Rating
Obtain age ratings for your game for all regions which it is going to be available for purchase.
Submit Game for Review
Submit your game for review by Nintendo.
Requirements missing or found errors? Report

How-To Articles
A list of useful links for you:

Nintendo Developer Portal - FAQ
FAQ regarding developing games for Nintendo platforms.
Nintendo Developer Portal - The Process
A quick overview of the steps to get your game released on a Nintendo console.
Link missing here or found errors? Improve How-Tos