The fastest way to reach Elecart is email: support@elecart.us
If you bought a template on Etsy, you can also use Etsy Messagesfrom your order page: both routes reach the same person, usually within one business day.
Most questions are answered in the FAQ section of each template’s page: Excel versions, Google Sheets compatibility, refunds and row capacity are all covered there. For anything else, include your Etsy order number if you have one, and describe which tab and cell you’re stuck on. Screenshots help a lot.