Please try to briefly and clearly tell us: What you want, What you tried, and What happened.
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I just downloaded version 3.0 From the User's Manual, Itried:
Password protection
To protect an entire document from being viewable without a password, use the option on the Save As dialog to enter a password. This option is only available for files saved in OpenDocument formats or the older OpenOffice.org 1.x formats.
1. On the Save As dialog, select the checkbox beside Save with password, and then click Save. You will receive a prompt.
However, there is no checkbox for "Save with password".
I, unfortunately, check the box to erase version 2.x, so I can't easily do it from there.