With MFD in clock/compass mode:
Press & hold BOTH "MODE" and "SET" buttons for 2 seconds.
Adjust hours w/ "MODE" button
Adjust minutes with "SET" button
presse "MODE" and "SET" again together to end procedure.
If you want a PDF of that owners manual, send me a PM w/ your email address and I'll forward one to you. They should also be available for download through the Owner Center link on the Seadoo website.