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for changing About Me you must copy:
/components/com_community/templates/jomsocial/layouts/profile.about.php
to
/templates/[your site template]/html/com_community/layouts/profile.about.php
after that you can customize that file.
you cant replace about me with other one, because that part of core files. if you want to add new one. you must create new community plugins:
/plugins/community/
please have a look that plugins to learn the code, so you can create new one.
1)
for RS form, please asking RS form provider about it. they must providing jomsocial integration plugin for that.
2)
so far there is no third party review/testimonial system for jomscoial
3)
for creating jomsocial plugin, it's same for joomla plugin. because jomsocial running under joomla:
docs.joomla.org/Creating_a_Plugin_for_Joomla
you can see some plugins code at /plugins/community/
my suggestion, better you hire web developer for build that plugin.