Select Periods.
Double-Click on the period you wish to open.
Uncheck the Period Closed box.
Save and Close out of the screen.
Restrict General Ledger Periods
Users with appropriate role permissions can still post into the period, but general users would not. (For Clients wanting to soft close an accounting period so that normal users can no longer post or modify batches. The actual accounting users can still post their month end entries or make normal adjustments.)
Select General Ledger at the top.
Select Periods.
Double-Click on the period you wish to Restrict.
Check the Restricted box.
Save and Close out of the screen.