So ...

First of all, you'll have to install their free browser extension. Simply visit the official Grammarly website which will automatically detect your browser and show you a button to add the given extension:

And there's a big cherry on the top: we are talking about an extension that works across all websites! In other words, you'll get instant proof-reading for your emails, social media posts, Google Docs, etc.

Just click the green button to get started and follow the on-screen instructions. When the process is complete, you'll notice a new Grammarly icon added to your browser ...

... and a new page will appear allowing you to create your free Grammarly account:

Enter your email, define your password, fill up your name and finally, click the "Sign Up" button:

On the next screen Grammarly will ask you to select why you write and which level of writing skills you have. However, these are optional questions and you can simply skip them if you want:

Finally, you'll have to choose a plan - free or premium - for your account:

If you want to use the premium edition, you'll have to complete the checkout process, otherwise you'll be taken to your Grammarly account page:

And that's it ... Once you have created your account, the Grammarly browser extension will start working in your Wordpress post/page editor (and any other text field across the web).

So let's see the magic ...