https://vborg.vbsupport.ru/showthread.php?t=196749
Or you have to use conditionals in the postbit template:
<div style="color:<if condition="$post['
fieldX'] & 1">red</if><if condition="$post['
fieldX'] & 2">blue</if>;"><USERNAME CODE HERE></div>
Please note the code above is not going to work and will require you to customize it. But the idea is there. You will need to wrap some code around the username code and have the way I have it there with 2 conditionals displaying the appropriate color depending on which value is selected for a profile field.
I don't have the actual postbit code handy so I can't help. But that should be a good starter.