You can add a security site seal to your checkout flow. First, you need to make sure you have copied your template across to your FTP account. Once you have made sure you have a local copy of your template you'll see the following folder structure under Templates > File manager from within your Instantcart store control panel.
Locate the checkoutPayment.template.html file, by navigating to the templates > main > checkout folder.
Copy and paste the following code into your payment template:-
<img src="https://ssl.comodo.com/images/comodo_secure_100x85_white.png" alt="Wildcard SSL" width="100" height="85" style="border: 0px;"><br> <span style="font-weight:bold; font-size:7pt">Wildcard SSL</span></a><br>
Once saved, you should see a Comodo padlock icon on your checkout page. Comodo supply all our SSL certificates.