Hi nontononline, thanks for your purchase.
You can find some informations on how to use the plugin here, in the blog of my site.
What do you mean with “posting text”? Are you talking about title and description for every single video? If the answer is yes, just go to the single admin post/ page and check for the box called JW Player 7.
In the single visible field you can add the media url that you want to publish but, clicking on the “More options” button, you will find a lot of tools available for your content.
Don’t forget to set the options in the JW Player admin page first, ok?
Please, try and let me know if everything is ok.