To get SendGrid API key information Follow the following steps
Step 1: Login to your SendGrid account
Step 2: From your Dashboard click on settings and then on API Keys
Step 3: Click on create API key to create a new API key
Step 4: Give a name to the key and customize your settings and click on Create and View
You would be shown an API Key
Copy the API key and use this API key to connect SendGrid account to SmartReach.io