Hello qwk I decided to make use of the trust system but I'm a little confused, lets say I decided to add the users below to my trust list, from the image below please answer my questions.
    

1: what's the maximum number of users I can add to my trust list?
2: that which the back arrow is pointing at what does it mean?
3: that which the red arrow is pointing at, what does it mean and what's the maximum number to write there?.  

I'll appreciate if I get a direct answer from qwk or someone who truly knows the answer to my questions and not just some random reply.