"Okay, explain how I could get "At least 2 or 3 feedback/trades on forum" when no one trusts me to trade with me in the first place."

you can start buy buying some small items, and do small trades, you can also use escrow if there is trust issue

"And how does providing an ip address help you, I could tell you anything."

it helps because it will be checked if it corresponds with your address, if you give a random ip address, then the info you give is not good

"And what about being anonymous, that is why I got into bitcoin so  "

i tried to give loans , without asking for info, most people paid back, but few didnt and i couldn't continue that, so we have to ask for info/details now.

"4. Active in forum X
supposed to mean. How is that measured objectively?"

it means , you have to login to your forum account once in a while, some for example take a loan, and forget to pay back because they werent active in forum and never visit the forum for a long time, so then its suspected they were scammers

it helps because it will be checked if it corresponds with your address, if you give a random ip address, then the info you give is not good