To edit your restaurant page yourself, you need to create an owner account.
Create an owner account
If you already have an owner account, please see this help page for detailed editing instructions:
https://help-for-restaurants.autoreserve.com/hc/ja/categories/5429905646873-%E4%BA%88%E7%B4%84%E5%8F%B0%E5%B8%B3