At the account creation, you will be in the "Trial" plan. You will be able to stay in this plan for 15 days after the signup. In this plan, you have the same functionalities as in the "Professional" plan which allows you to test everything that Bleemeo offers.
Once the 15 days have passed, if you have a payment mean you will automatically switch to the "Professional" plan otherwise you will go to the "Free" plan. You can always add a payment mean to switch back to a paid plan if you have switched to the free plan.