add custom field

hello all,
current i using Wp 3.3.1 and latest Buddy Press
all are is going well
but little bit help in this plugin after that i purchase it
i make a social community site for specific religion people
i wish to use gravity form plugin for member to fill his/her family detail
but confuse in member post field
when member fill the form of family detail
any option available for member add or remove custom field like name,age,contact no.
e.g. add son/daughter name field
if there option available in this plugin
thanks

Hello, Thanks for reply
my query is :
buddypress user can add more field in gravity form ?
let me clear once again
i make a social website and i want to use gravity form for member's
when member fill the form he want to add another name field is that possible for user ?
i know admin can modify the form and add anything he/she want
but can user add extra field not from form setting but add from form
is there possible ?
thanks