So I’ll be making a detailed guide here unless it already exists.

Must be in Spanish language for this to work

Pretendos website is not very good at being detailed after installation. So this should be more detailed.

After install, you need to make a new account thru pretendo (any changes to the account thru here HAS to be done on console only). Next, you’ll need to go to system settings. Then, tap the option on top that says “Nintendo Network ID” (Need WiFi connection for this). (FYI: If you’ve already a Nintendo account here, make sure to use the pretendo nimbus app to switch to pretendo servers). If not, just tap the option that says Create new ID. Tap next on the personal Mii (it’ll prompt you to make one if you don’t have one yet, takes literal seconds to do.) Scroll down on the Linking to other systems all the way to where the two options “Back” & “Understood” are. Tap on Understood. Then just tap on the option for the Agreement (nothing really to see here except now it says pretendo). Tap “I accept”. Then it’ll ask you to enter in user information. Once at the part where it says “Nintendo Network ID”, put in the info you put on the pretendo website, followed by the “-pretendo” (without quotations). Next, for email, put the same email you used when making your pretendo account (Make sure to check your email for the pretendo account activation). Once all that’s filled in, tap “Done”. Verify everything is correct and then tap the “Done” button. Once it connects to the pretendo server, it’ll present basically the same thing the NNID server did, both are optional. Once all done, you should get a email from pretendo with your user id having the “-pretendo” extension. If you get this email, you’re all set.

Then upon first load of the Pretendo settings on the console, sign in like usual, then go to next page where it says Email confirmation. Make sure it’s the same one you setup both on pretendo and the nnid setup.

If you still need any help, feel free to comment below.

FYI: most people still get confused by YouTube guides as most people either talk too fast or aren’t descriptive on details.

Update: the “-pretendo” extension is optional according to u/kevinsnijder. Console still must be in Spanish language to do so