When you start with the platform you'll build your first keyword strategy, and assign these keywords to the current (or as-of-yet not created) pages on your website.

But what if you want to update those keywords? 

You just simply need to navigate to the 'Keyword Research' page.

Once on this page, you can chop and change your keywords, as you did during the on-boarding process.

If you click onto 'chosen keywords' you will have the ability to remove keywords.