If you need assistance for a free plugin or if is a pre-sale question, just leave the License Key field blank.

For free and paid support with WPeMatico Plugin or its Add-ons you must:

Attach the debug info file from your site.
Find it in WPeMatico > Settings > System Status tab from inside of your WordPress administration area.

If you are a Client:

Fill in your order number.  Find it in Your Account.
Fill in the licence key of the main product.