You should complete the Enrollment Form as soon as possible after it becomes available to you, but no later than 30 days after the start date of your service. If you applied to AmeriCorps through the My AmeriCorps portal, you will be asked to fill out the Enrollment Form after you accept the offer. If you applied to your AmeriCorps program outside of My AmeriCorps and received an invitation to enter the Portal upon acceptance by the program, you will immediately be asked to fill out the Enrollment Form.
See also:
Is the Enrollment Form required?
What information will I need to complete the Enrollment Form?