CURL needs to be installed properly. It won't work until you see a result on this page:
There is nothing I can do from here. It is something your hosting company is going to have to deal with. I've hosted the page on the webassist server so you can see what it would look like if CURL was actually installed and running properly.
You will have to open a support ticket with your hosting company to get this resolved. I won't be able to help since it is a server configuration issue and not an issue with your code.