Hello, Marcia!
I know you are excited about becoming an Annual Passholder! It truly is the best way to have the "World" at your fingertips. Not to mention the incredible perks that come along with it - like early registration opportunities for runDisney events.
However, in order to be eligible for your Passholder perks, like early registration, you have to redeem your purchase voucher for your actual pass - this is the day your one-year of theme park access and Annual Passholder benefits begin (they do not begin on the day you ordered your pass).
You'll need to have redeemed your purchase voucher for your pass and have it linked to your My Disney Experience Account in order to access the member page and early registration form on April 22nd. Also keep in mind,
Walt Disney World Marathon® Weekend presented by Cigna® does not sell-out as fast as the smaller races and the full marathon is usually the last to sell-out - if that helps in your decision on whether or not to activate your one-year pass early.
Thank you for your question, Marcia! Please do not hesitate to reach out to me with any additional questions you may have.
Faith