Who is the author of VM?

[ReneZ]

The name of one of the scribes is Ulrich.
But I can't read the text.

Well, it is only a wild guess, of course, but there is some logic behind it.
To explain this logic, let's look at the short Chinese sentence:

你喜欢咖啡还是茶

Pasting this into Google translate will give its meaning, and a closer look may also reveal that there are two characters in here that are not 'really' Chinese. They do not mean anything, but represent sounds:

咖 = ka
啡 = fei

and the result is ka-fei meaning coffee.

So now one may entertain the hypothesis that something similar might be happening in the Voynich MS.

Most of the text is written in some sort of system, but certain words are inconvenient for this system, and are transliterated rather than 'encoded'.
It has been suggested that the four stand-alone words on You are not allowed to view links. Register or Login to view. are the names of four of the participants in the creation of the MS. The first one reads:

ydaraiShy

This is a rather non-standard word, similarly to  doary which has been suggested to represent: taurus
Thus, this might be saying: udaric(h)us

Now Udaricus is one of the latinised forms of Ulrich , perhaps less common than Udalricus, but both are attested.

Clearly, this is just a hypothesis, and I am not betting any money on it, but it is not completely out of thin air.