If you want to add extras to your Mentionlytics subscription, first, you need to subscribe to Advanced or a higher-tier plan.
You can find the “Change extras” option in Settings → Plan & Billing.
Important note: Once you purchase any extras, please be aware that the additional charges will continue in the next monthly billing cycle unless you cancel them manually.
To add extras, you need to click on the “Change extras” button, as shown in the screenshot below.
You can view the Extras invoice at the bottom of your Plan and Billing section.