Select Maintenance > Commit Changes from the menu bar or
Click Commit Changes 
on the Maintenance Toolbar.
This topic describes how to commit (save) your changes to the translation memory in the TM side-by-side editor window in the Translation Memories view.
To commit changes to the translation memory in the Translation Memories view:
Select Maintenance > Commit Changes from the menu bar or
Click Commit Changes on the Maintenance Toolbar.
Any translation unit updates or deletions are now saved to the translation memory.
Overview: Managing Translation Memory Data