Yamaha O2R Owner's Manual page 68

CANCEL is the default. To cancel the STORE operation, either press the
[ENTER] button or wait about 10 seconds — the STORE operation will be
automatically cancelled.
To store your settings, use the CURSOR buttons to select the "EXECUTE"
control icon and press the [ENTER] button. The dynamics program is
stored.
Note: If you decide you do not like a dynamics program after you have stored it,
it is very easy to overwrite it by creating new settings and storing them to the same
location. Conversely, it is also very easy to accidentally overwrite a valued
dynamics program.
YOU SHOULD ALWAYS BE CAREFUL WHEN THE 02R DISPLAYS ITS
CONFIRMATION POPUP MESSAGE!
Digital Recording Console 02R Getting Started Guide
Secondary Recording Tutorial
61