Things to Note：
A member redeem code extends your existing membership
You need to have a Grid Diary account before using the member redeem code（Please sign up within the app; web sign up is not yet available)
A member redeem code has an expiration date, which should be specified on where the offer was given
How to Redeem：
Visit https://diary-app.sumi.io/me/redeem，sign in with your Grid Diary account
Follow the steps on the page in order to enter your redeem code