If you want to stored regularly current tag values of Monitor Program, select Add button in the database save list item dialog box. And, select a tag displayed in the tag list such as <Figure 1>.
<Figure 1> Add a tag to Database save list
Select a stored Analog or Digital tag to database in the <Figure 1>, and push the OK button. Then, be Added a tag in database save list.
Reference) Displayed Analog or Digital tags in the <Figure 1> is added tags in the Studio.
Relate items)
Adding/Modifying Database Connection String