I feel your pain - Zecco Holdings does not make it very easy to locate your account number. Here are step-by-step instructions that are sure to help you locate your account number.
1. Open a new tab in your browser and go to www.zecco.com
2. Sign in to your account with the ussername and password you created when you opened the account
3. Click on the pink trading tab in the upper right-hand corner
4. This login page should prompt you to enter your trading key - this is different from your original password!
5. Once you have successfully logged into the trading center, you will see all the positions that you currently hold (if any). On the LEFT HAND side of this page, you will see a list of tabs that are in all CAPS. The second one from the bottom says "MY INFO." Click on the "MY INFO" tab and you will be prompted to enter your original password that you used in step number 2.
6. Once you have successfully loffed into the "MY INFO" page, you should see a detailed report with all of your banking and identification info. The very first number listed at the top of the "report" is your account number.
You are probably kicking yourself over how easy it is but I admit, it's a little confusing without the step-by-step instructions.
Hope this helps!