Change Text in Package Display (or Add Listing) Page

How do I change some text on Add Listing/Package display page? Please see attachment. I have highlighted the sections that i need to change.

1. The <h2> heading and the associated sub-text

2. bellow the pricing it shows the number of days the membership is valid for. Can I show the “sub caption” related to the packages (see attachment “package field.JPG”)

3 and 4. Same things for as 1 and 2, but for membership

I looked at a lot of the theme files and couple not find where this text is calling from. Also searched the forum, but no luck.
Thanks a lot in advance!!!