I am putting in a registration form and the form seems to have too many fields for me and I am thinking that some of this might have to do with K2 (I am new at K2). I don't want the personal info on the registration page along with male and female selection. Are these options somewhere in K2 because I can't find the options under Admin > User Manager > Options or under Modules > Login Form > Edit or Options (I also can't get the fields that are showing that ask for username, email, etc to show the original background behind the descriptions. Can anyone possibly help me with this?

All I really want on this form is Name, Username, password & verify password on the reg. page.

See attachment for description of what I am talking about:

It's under Component -> K2 -> Parameters -> Advanced

Set the Enable K2 User Profile to NO.

Is it possible to add the 'Additional Details' block like when registring to the K2 site?
If yes, Is it possible to add/remove some fields to/from 'Additional Details' block?

Depending on which plugin you are using it is possible (or not).

Hi Krikor,
Thanks to your comment I figured out that I should activate User - Profile plugin and that part works fine now.
However, can I add/remove fields from the Additional Details without having to change the file?

The additional Details fields are generated from a plugin,
you can hide them with css or you can edit the plugin's settings.