I need help ASAP getting a workable shopping cart set up in gridmarket - I have shipping issues that

A live support person helped me get halfway through my project and then had to go. Now, my shopping cart doesn't shop up in my header, but there are buttons on each product putting them into a cart. I need help ASAP getting my site up and running! I'm frustrated with the "24/7" support. I'm not feeling supported "24/7"!