Since I have used the website many times, I am use to the quirks of the site. Under the search area, click on "design your own". Find the product you want, pick the color, pick the size. On the right hand side, click on "upload". On the left hand side click the copyright square then click in the box to pick the image to be uploaded. Make sure it is no more than 10MB. If the image doesn't appear in the front or back of the shirt, click on the image. Using the corners, pull the image to fit the outline. Once the image is set how you want it, stop. Then here is the tricky part: Go to the top and click "Buy Now". When the drop down menu appears, click "Buy Now" again. Then at the top click on "View Cart". The rest works the same as a normal checkout.
TAT is excellent.
As well as communication.