I don't exactly remember what was in those images, and I didn't keep them around. I might as well record a video guide, but it'll take a while. The previous video guide is still the most watched video on my yt channel lol!
There are generally two types of data in the save: strings (the words, like Trait.Size.Huge) and numbers, stored as hexadecimal Int32 values (like 31 or 4B). You edit the strings in the narrow middle column, which displays symbols, dots and alphanumeric characters. The numbers can be edited in the wide left column, in their hexadecimal form, or you can select them there and see their decimal data type representation in the rightmost text fields.
Regarding my response to Adam, the Traits data block has two more important numbers, other than just the strings of the traits: the amount of bytes (symbols) within the block (the hexadecimal 31), and a trait count (your breeder starts with two). Adam has added an entire trait onto his breeder, which means he had to add the amount of added characters to the sum of the block - the words Trait.Appearance.Hung (21 characters long), a string-terminating zero, and four bytes (Int32) describing the lengths of that string - a total of 26 characters. 26 decimal, added to 31 hexadecimal (49 decimal), gives you 4B hexadecimal (75 = 49+26). Both of those counters are before the trait strings.