I went to the profile of some users and clicked on the trust system and found that they got green trust and some of them have red trust.
And go to my account and see there is a post a new feedback and trust settings options. I really don't understand these things can someone give me some details please?
The feedback is a way of telling how a user should be trusted, for the people you saw green, it means that they are trustworthy people and you can trade anything with them, you have nothing to fear but you should still put caution when trading because it doesn't justify what happened in the future.
Similarly, a red trust person who have negative in their profile, the feedback should tell you what they did and a link as reference will be there on their profile why you should not trust them or even trade with them but again, you need to check the reference link to see if the accusations is justified or maybe not, there are instances where red trust and feed back are later change to neutral tag.
In addition, if you want to be a DT2 member, someone in DT1 must add your to his trust list. If you want to become a DT1 member, theymos must add you to it.
Not necessary DT1 must include you to become DT2, numbers of DT2 can include you to become a DT2 also.