How do i get Credit and what are the differences between member groups?

Hi to all! I'm glad to be a new member.

I'm sorry, my english is not too good. One thing was not much clear to me, I can earn credits if i login here every day?

Best regards.
 
sorry but I don't understand this diagram, could you explain in another way, thanks.
 
Hi,
I have just registered and it is impossible to present myself in the right section, insufficient right.
 
"Member Group will auto free upgrade to Iron Member after next day , when submit 5 approval messages ." Whether to post five threads or reply to five messages ?