Make sure you are in advanced mode. This is a selection in the menu setup menu tab. It is called User Mode. Then you want to enable snapshot. This is done from the menu the last on the right.
Snapshot and recording is a key selection on the snapshot menue. You might want to refer to the user manual for detail usage.
Then you will want to have an SD card in the unit.
many will work .... it just depends on the amount of data you want to record.
See the search tab in the forum for SD card and search.
Chuck