help with free classifieds osclass script ???

[osclaza]

I  have a free classifieds osclass script but I need to make the following changes (I need to learn how)

1. to change the icon on the script from saying "Publish your ad for free" to saying "Publish your paid ad here now"? 

2. to change the icon on the script from saying "Register for a free account" to saying "Register your account now"?

btw, I have bought Payment Pro plugin which is now accepted by the osclass classified free script.

Regards.