The Buddypress xProfile Rich Text Field plugin adds a Rich-text Editor custom field type to Extended Profiles in BuddyPress.
Please note: this plugin is no longer required because its functionality has been implemented since BuddyPress 2.4. Having said that, if you already have data in xProfile fields of this type, you will need to keep this plugin active. See:
https://buddypress.trac.wordpress.org/ticket/5625
If you are using BuddyPress 2.0+ and your theme does not use compatibility mode (i.e it supplies its own BuddyPress template files) then you will have to update your theme’s members/single/profile/edit.php and registration/register.php (or members/register.php) templates so that they match the new way of displaying xProfile fields. You can refer to the relevant BuddyPress files to see how that’s now being done. These are bp-templates/bp-legacy/buddypress/members/single/profile/edit.php
and bp-templates/bp-legacy/buddypress/members/register.php.