Free users cannot add more credits if they use up all the credits they have. If free users want to have more credits, they can either wait until next month or upgrade to Pro users or Premium users.
For Premium users, they are able to add more credits if they have used up all the credits. To buy extra 100 contacts and 300 Analytics, Premium users need to spend 80$.
Click on "Buy more credits"
Users are able to choose how many quantities they want to buy.
For Pro users, please directly send email to [email protected] or use chat channel to talk with our people.