Lets Immediately get into it (this first part assumes you don't have a Modded Wii U) SSSL: Things to know is that SSSL is Limited meaning that this method may become outdated and may stop working, And Miiverse/Juxtapostion does not work and all games that are public some may not work,First you open system settings, Internet settings,Go to your WiFi settings, go to your DNS Settings,set Auto Obtain to no and put this DNS in 88.198.140.154 this DNS may change if it doesn't work tell me, then set the secondary DNS to 8.8.8.8 (Google Public DNS) and 1.1.1.1 if yours is Cloudflare.

Inkay: (this part assumes you are on the Aroma Environment and a home brewed Wii U) download the Stable Build for Inkay here >https://github.com/PretendoNetwork/Inkay/releases/tag/v2.6.0. Then download the WPS file. Next download nimble and as Jon Barrow Explains it "Nimble is an Aroma setup module that patches the request for the system PolicyList. This is used to enable background tasks for features such as Wara Wara Plaza. This is separate from the main Inkay patches as the PolicyList is downloaded earlier in the system boot process than Inkay has control over." To download the Nimble RPX Go to here > https://github.com/PretendoNetwork/Nimble/releases/tag/v3. Next place the Inkay-pretendo.wps file on to your SD card from Wii U to Environments to Aroma to Plugins And drop the WPS file there. Next place 30_nimble.rpx to Wii U to Environments to Aroma to Modules to setup. its normal to see other Aroma set up module's in the folder. Put your SD card back in your console and boot like normal, you should see the notification on the top left say "Connected to Pretendo Network" you are now connected to pretendo. Press L+Down on the D Pad+ SELECT to open theWii u System Plugin configuration menu (basically that's the Wii U's Luma 3DS Menu) choose the plugin 'Inkay', then choose other settings and tap A on "Reset Wara Wara Plaza" )this may say something else possibly) After this reboot your console. Your On now! But you need to set Up PNID explanation in comment! But after your done setting up PNID start playing Splatoon, Share Your levels on Mario Maker and play with people on Mario kart 8! Have fun!