Hi. Some URLs can be changed, some others need to be changed in the theme (or core), unfortunately.
In BP 1.5, root-level pages e.g. .com/members and .com/groups are controlled by standard WordPress Pages. You’ll be able to rename title and slug by editing the Page details.
URLs like e.g. .com/members/admin/**groups**/ are changed as detailed on https://codex.buddypress.org/extending-buddypress/changing-internal-configuration-settings/ (“Change the URL slugs of BuddyPress components”).
URLs like e.g. com/groups/group_name/**send-invites**/ have to be changed by editing the theme files, and filtering parts of the BuddyPress core output.
