If you don't want to deal with VBA, you could use a Macro to run a Query.
Create an Append Query based on your table. Choose your table as the Append
Table or target table. In the Criteria portion of the Query, you will put
the controlnames as the condition. Exp:
[Forms]![YourFormsName]![YourTxtBox]
Then on the click event, choose Macro. On the Action pull down, select
OpenQuery. In the Action Arguments Box at the bottom, select your Query
Name, and Data mode. Save your Macro and exit.
When you click the button, it should run the Append Query, and update your
table. Macros are easy to use for certain situations. Once you become more
familiar with VBA, it allow you greater flexibility to modify actions on the
fly. Good Luck!