Hey, bro!
I'm also a Mac user-- I also use Windows ON my Mac whenever I need to (since Boot Camp is essentially free-- all you do is download a legal ISO of Windows 10 straight off Microsoft's website then use it with Boot Camp Assistant),
but you can actually use Wiimms on the Mac...
Firstly, about the SD information-- as it says in the README, you have to copy the save file information from your SD TO your actual Wii/vWii.
As for using Wimms, here:
Download this Mac version of Wiimms. Extract the files in that.
Then open up Terminal -- it's a program in Applications > Utilities, if you've never had to use it.
In the Wiimms files you've extracted, there should be one called "wit". Drag that into the Terminal window.
So after the dragging, it should say something like...
Code:
[yourusername]$ [pathtoyourfolder]/wit-v3.02a-r7679-mac/bin/wit
Then, type in "EXTRACT " (mind the space) after that.
Code:
[yourusername]$ [pathtoyourfolder]/wit-v3.02a-r7679-mac/bin/wit EXTRACT
Then find your ISO file and drag it in after the space you typed.
Code:
[yourusername]$ [pathtoyourfolder]/wit-v3.02a-r7679-mac/bin/wit EXTRACT [pathtoyourISO]/IKENIE.iso
Then type in "DUMP".
Code:
[yourusername]$ [pathtoyourfolder]/wit-v3.02a-r7679-mac/bin/wit EXTRACT [pathtoyourISO]/IKENIE.iso DUMP
Hit Return/Enter, wait a little while, then check your Username's folder. A folder called DUMP should appear, which you can then put files into!
Then you'll essentially do the same thing after you're finished. Drag the "wit" file into the Terminal window again...
Code:
[yourusername]$ [pathtoyourfolder]/wit-v3.02a-r7679-mac/bin/wit
Then type in "COPY DUMP ENGLISH.iso".
Code:
[yourusername]$ [pathtoyourfolder]/wit-v3.02a-r7679-mac/bin/wit COPY DUMP ENGLISH.iso
Hit Return/Enter, wait a little while, and in your Username's folder, ENGLISH.iso should appear!