There are two reasons to see that message:
- The user group in which you are does not have permissions to make donations.
Solution: You have to allow donations for user groups.
- You have selected a payment wizard type in four steps but you have not installed or enabled a third-party extension, that implement additional functionality on the second step. That extension will allow you to continue to make donation, it must be present.
Solution: make sure extensions like JoomFundingPayment Login, JoomFunding Data,... are enabled.