There is a different usage limit (amount of credits) for each plan, and each credit = 1 background removal.
Background removal is included on our design plans.
You can subscribe to any of our design plans, and here you can find the amount of credits available for each plan:
Design Free: 5 credits
Design Pro: 200 credits
Design Business: 1000 credits
See the background remover in action here and watch these tutorials to learn how to use the tool: