Modifying registration page, adding textarea how?

Hi
I want to make nice look on registration page.

Now it looks too much info needed impression.
But in fact only basic info is needed to fill out and register and the rests are optional.

So I want to add lines like
"Followings are optional to register"
Or "Let's get to know each other more" for more details on registering users.
Dividing by subjects and make better look.

Can I add those lines on registration page on the hard coding page only(I know where to change)?
Also the checked items...I want to make it nicer...also it's hard coding and css modification?

Just want to double check if that's the only way modifying registration page.

meetupkorea.com/component/comprofiler/registers

Also I want to add MORE ABOUT ME
section where user can introduce more details.
I assume it's textarea feild type.
I saw cols and rows...minimum etc...
Is there guide or document on how to do that?
I am playing around but it doesn't seem to work so far.

Thank you for your guide!

You can add dividers to the registration page using delimiter fields created from field management. Simply add them to registration and your tabs. No need for altering any source.

Also I want to add MORE ABOUT ME
section where user can introduce more details.
I assume it's textarea feild type.
I saw cols and rows...minimum etc...
Is there guide or document on how to do that?
I am playing around but it doesn't seem to work so far.

Yes, the documentation which you've kindly and gratefully paid for. Please see the Advanced download section and grab yourself a copy of the extensive CB documentation!