First of all, welcome to bengalspider. Yes it will take some time to get familiar with this site. You have to go through all the rules and regulations thoroughly. There are guidelines for posting. Read them carefully. I'm listing some points on how you can earn cash from this site.
1. Post something in different sections of this site. It can be a question, a comment or something that is useful. This is the best possible way to earn cash rewards. If you are very good at writing then write articles in any topic and post it in resource section.
2. This is the second best way to earn cash rewards. Refer your friends about this site and when they join with your referral link you get cash rewards as referral bonus. The higher levels they achieve the more bonus you get.
3. Participate in various contests that bengalspider announce from time to time. Most of them offer cash rewards.