The easiest way to send donations is by check through the mail. This way there are no processing fees such as exist with PayPal or possibly other services:
Abhyasa Ashram
505 Hooper Drive
Fort Walton Beach, FL 32548

Abhyasa Ashram is a 501(c)3 Nonprofit organization.

Following is through PayPal: (note that they take a percentage as a donation; mailing a check avoids these fees.):