yes, that what she asked me in PM.
Maybe I'll post it here to help other users.
I edited it a little to be more generic.
to launch the homebrew launcher, you have different methods :
1. the easiest is maybe to install the homebrew launcher channel, so it's easier to launch when you want it. This method don't need the homebrew launcher on SD card.
2. the second method is to use the exclamation icon, but like you said, it freezes. before it freezes you can enter the CBHC menu (press the home button when you launch cbhc). from the menu you can choose to launch the HBL (homebrew launcher).
3. At console's boot press the home menu. from here you can access the boot menu and select the HBL.
For method 2 and 3 you need the homebrew launcher file in your SD:/wiiu/apps/homebrew_launcher/homebrew_launcher.elf
For method 1, you need this one : https://github.com/dimok789/homebrew_launcher/releases
It's usually recommended to not touch the icon, so I recommend step 3 to launch it the first time.
from the HBL, run WUP installer GX 2, and install the HBL channel.
set CBHC to autoboot sysmenu and use method1 to launch HBL.
There's a method 4 which consist in installing another NDS game for haxchi.
you don't need an official (paid) NDS game this time as CBHC already provides signature check to launch haxchi. Just be extremely careful not to overwrite the NDS game already used by CBHC or you'll brick your console !