purchasing USPS

I asked how to get USPS for our cart as I am new to open cart awhile back. I got two replies with very little detail w/ a link that leads me to a site where I can purchase it for $25. What happens after I do this? Does this automatically apply to my cart or do I have to sync it somehow?

PLEASE...if you respond, give me a detailed answer. Thank you!

Hi spanky,

I am the creator of the USPS module. When you purchase the module, you download the zip file. Inside the file there are install instructions. It is very simple drag-n-drop. No files to overwrite. No database files to muck with.
Once the files are copied onto your server, they will appear in the Admin "Extension->Shipping" menu. There you can click Install, and then Edit to configure the module.

If you have any questions I am usually available for chat from the link on my site.

Thank you. That sounds easy enough!

Is it still necessary to purchase your USPS extension or does the new version of OpenCart have it already built? I recently installed the new version of OC and there was listed among the shipping extensions a USPS option which I then enabled yet it still doesn't appear as an option for customers to choose from for shipping. The free shipping module works fine and a few of the others that I have tested. Pardon my ignorance, I'm still new to all this.
I tried searching the forum in a couple of different places to find a relevant topic. This was the closest I could get.

Yes, Daniel has created his own USPS in v1.3.3+ so if that one works for you then you no longer need to buy mine. Mine will still support v1.3.4 and later