◼︎Delete a memo from memo itself
Tap on a memo icon, and tap "Edit", then tap "Delete".
Please refer to the following manual.
【Web】5.4 Attaching Memos ▼Attaching memos ☞ Memo 

◼︎Delete a memo from "My Data"Select "My Data" from the side menu.Select "Memo" button, and tap on "-" icon next to the memo to be deleted.Then tap "Delete" button.

Please refer to the following manual.
【Web】5.6 Searching Contents ▼Searching from [My data] on the side menu ☞ Memo