About news comment and create an account question

Hi, i have two question,

I test function:
I go to "Get started in seconds for free" and click Join HERE, then i create an account, when i got the account email and login the web and to see the news but i can't comment just can see the news.

I go to the Home -> click Register and choose Grace Minister ( GM ) to create an account then i login the web and to see the news but i can't comment just can see the news, but i choose Free Member ( FM ) to create an account can see the news and can comment.

Hi,

what is the different for on the homepage "Get started in seconds for free" Join HERE and Home -> Register?

If i don't want the "Get started in seconds for free" Join HERE, just want the Home -> Register, how to setting?
And i want the "Get started in seconds for free" Join HERE function is the same of the Home -> Register, how to do?