To purchase more text message from desktop:
Step1:

Step2:

Step3:

To purchase more text message from mobile app:

Due to much higher cost of text message in Australia, UK, Free SMS included in Beginner Plan is 100; Free SMS included in Rising Star Plan is 200;
Included in plan: Message amount included in your monthly subscription plan. Unused amount will be cleared each billing cycle.
Purchased: Message amount purchased. Unused amount will be moved to next month
