Complete these steps. Link a Nintendo Account to your Nintendo Switch console. Access the Nintendo eShop on the Nintendo Switch console and select your Nintendo Account. If your Nintendo Account does not already have a primary console, the console used at this time will be activated as the primary console. Purchase games and/or add funds in the ... More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.