To join online:

1. first log into your profile or create a new profile at www.isaca.org/login
2. Once your profile is complete and up to date, and you are logged into your new account, Select Join Now under the Member Status Tab  
3. Choose your membership and click Join Online Now and follow the prompts to fill out the member application fully online 
4. When you reach the checkout page, select a payment method.
   1. Options include paying immediately by credit card online, or if you require an invoice, select the Pay Later option 
   2. ISACA accepts VISA, MasterCard, American Express, Diners Club, and Discover Card
5. Membership is effective the same day if payment is processed by credit card
   1. If not, membership will be activated upon ISACA headquarters receipt of payment in full 
   2. Complete payment includes ISACA international dues, relevant Belgian chapter dues (calculated at checkout)
   3. the new member processing fee if the application is to become a new member.

For more information, please see this short video: How to Become an ISACA Member - YouTube