You need to enter your Account Settings and select Your subscription and account.
There, you can see your current limits and extend them by clicking on '+' in the 'Buy more' column. Once you’ve added extra keywords or users, click on the Save new limits button.
Please remember that extra keywords stay in your account, so if you need those just for one campaign - come back here when it's over and change the limits to old ones. Prices stated next to the limits are monthly prices.
We hope this article has been useful to you! If you have any further questions or need help, please don't hesitate to get in touch.