The instructions given involve C and some Python programming.
I haven't tried it yet but it seems like you can read from and write to the RAM with certain functions.
rpc.read32(address, num_words) - Read num_words words starting at address, returning a list of words
rpc.write32(address, words) - Write each word in the list words to memory starting at address
Unfortunately my Wii U version is 5.0.0 E and there's no exploit for it yet.
It can be "ported" to that version though.