Editing your participation in a sign-up sheet only takes a few seconds.
Good to know
Editing your participation requires that you have a Doodle account and that you were logged in to your Doodle account when you submitted your original booking.
Additionally, editing your participation requires that you are logged in to your Doodle account to make the edits.
Step-by-step:
Login to your Doodle account
From the New Dashboard Beta, select the event you wish to edit your participation in under the 'Upcoming Events' section
Click 'Update'
Click 'Edit booking'
Edit your booking
Click 'Update'
You will receive an email confirming your edits.