So its just adding value 30 in your diasvip table.
Mysql Script example below.
Insert into ragnarokTable (col1, col2, col3, diasvip) Values ('','','','30')
You can run that on mysql sql or any mysql program you got. Change ragnarokTable to your target table, change col1 col2 or col3 to your login table columns, you can add as long as it exist in your table.
if you can give me a screenshot of your login table, I could give you the whole code.