How can I change the wording of Community Builder areas?
CB uses its CB Plugin Manager to install CB Language plugins. If a CB Language plugin is not installed, then the default language plugin files (present in CB) are used. You can of course alter these default files directly, but you would lose these alteration when you upgrade CB in the future.
Best approach would be to install the English CB Language plugin (available in the CB Language forum) and alter its files to your liking.
Once installed the English CB Language plugin will create a new folder in your components -> com_comprofiler -> plugins -> language folder (the default_language folder is also located here).
Just edit the php files in this folder using your utf-8 text editor - find the strings you need and modify them.