For us to be able to connect your website to your Mailerlite Newsletter we will need your API key. Do the following to obtain your API key and send to us.
Login to your Mailerlite account here: https://app.mailerlite.com/
Once logged in click on your profile name in the top right corner and then go to "Integrations"
Now under the Developer API section click the "Use" button
On the next page you will see your API key. Copy this and send it to us