Follow below steps to add product description.
- Login as your WHMCS admin
- Go to System Settings >> Product/Services
- Edit product or add new
- Add product description like below and save the changes
<ul class="list">
<li>Starts with <b>1</b> site</li>
<li><b>3</b> environments/site</li>
<li><b>25K</b> visits/month</li>
<li><b>50GB</b> bandwidth</li>
<li><b>CDN & SSl</b> included</li>
<li><b>Migrations</b> free</li>
<li><b>Page Performance</b> free</li>
<li>Powerful <b>tools</b> available</li>
</ul>