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so my data has collumn thats called isDone (default value 0) with 0 or 1 for the value,
How can i make custom button to edit the value of 'isDone' to 1 when clicked

You may use Row_CustomAction server event.

so i need to make custom php file for example update.php with row_customaction function, and make button thats linked to the update.php?

You may put your code in the server event directly, see the example in docs (see link above).

Thanks sir, but i don't know how to make custom button and link the button to the func in row_customaction.
Could you tell me the docs to do that?

To create the custom button that related to the Row_CustomAction server event above, then you may simply use Page_Load server event; see Example 4.