If there's a new keyword you want to add to your campaign you need to navigate to the Keyword Research page. You find this by clicking on 'strategy' in the navigation bar, then clicking 'keyword research'.

Add your chosen keyword into the 'New Keyword' box & press 'Add Keyword':

Find your chosen keyword in this box & click the '+' button. The platform will also give you a list of similar suggested keywords to look through.

Click to view your 'Chosen Keywords'. Click 'Next'.

Confirm the changes to your chosen keywords and press 'Save'.

You can then assign that keyword to a page in sitemap section, and the platform will also start to track where you rank in Google.