Change the text you can do by yourself using localization. Please read instructions how to translate contents here.
Or just use http://poedit.net/ to do this. In this case your steps should be the following:
1) Download and install Poedit editor
2) Run Poedit editor and open the language file with .po extension from /woocommerce-prices-by-user-role/languages
3) Click on the string you wish to edit and type the text you'd like to appear instead 
4) Save new files according to your WP localization
5) Go to ftp to the folder yoursite.com/wp-content/plugins/woocommerce-prices-by-user-role/languages and insert here new .po and .mo files
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