1. Go to the Dashboard of one of your domains
2. In the top right corner, click the "Add keyword"-button.
3. Here you will be presented with several options to add keywords.
Add keywords manually by entering keywords in the textbox
Get suggested keywords from the search bar under the textbox
Import keywords from:
Google Search Console
A local file (CSV)
An existing website
4. Once you have entered all keywords you wish to add, you can choose what tracking profiles to import the keywords to.
5. Once complete, click "Add keywords" in the bottom right corner of the popup.