To update or change your registration form, you must first sign in/login to your account on the Lyndon Website.  To do this, you will navigate to the website (Link) and then click on the LOGIN tab at the top right of the webpage.  

This will open your order page on your account.  In this page you should see "Manage Account" in the upper right hand part of the page.  Click on this tab.

Now, you should see your most recent Order Details but over to the left, you should see the following tabs:

My Account  (See below for details about this page)

Calendar (This will show your game schedule once the games have been scheduled)

Volunteer (Here is where you can request to Volunteer for a Coaching Position or you can edit your current request) 

My Orders (Shows your current orders)

Messages (I am not sure exactly what this is)  I will have to research it)

Home (Takes you to the home page of the website.

So, the main question you came here for was how to update our change your registration form.  

Go to My Account Page (Top Left Tab)

You will now see your athletes/children that you have registered.  There is a little pencil/pen icon to the right of the name of the athlete and/or Volunteer.  To update/change info concerning that athlete and/or coach, click on that little icon.   This will take you to ALL registrations for that athlete/child.  Please look for the correct season before you make any changes.  Now, just scroll to the area you want to make a change and then once you have made the changes you want, hit save.  

Please note that if you want to change your volunteer status, you will have to delete the current status and then re-enter your updated request.  To do this, go to the Volunteer Tab that is third on the list to the left and click on the little trash can icon first.  Then, click on "Find Volunteer Roles".  Select the role you want for the appropriate league (It will only give you options that associate with your child/children.  Select the option to Sign up as a Registered User and then hit the blue tab, "Continue".   You will come to your current details.  Make sure this is accurate and update your experience and then click Save.