If you have an ongoing trial or a free account, you can upgrade to pro version. 

To upgrade to a PRO account:

• Go to Your Account from the top right or hit this link https://planner.ganttic.com/account

• Select a PRO package by clicking on the green box. Ganttic recommends a package based on your resource count 
  
• You can choose between monthly or annual subscription

• Fill out the necessary fields and click on "Next" below. Please note that some fields are mandatory. If your company is registered in the EU then VAT code is also mandatory.
  

• Enter your credit card details and click on "Submit"
  

You have now successfully upgraded to a PRO account and the recurring subscription based on selected plan is activated.
If you want to view your receipts later, click "Receipts" from the menu on the left.