MySQL trigger to insert date to row with unique matching ID - mysql

Question

I need to write an SQL trigger to insert the date into a row of another table after an insert.
The data comes in as such:
A form is submitted to _OnsiteTable which includes a JobID, this JobID matches a current entry containing a JobID value in _JobTable. Upon insert of the data into _OnsiteTable I need a trigger that will insert the current date into a column called JobClosedDate in JobTable.
It needs to insert the date into the row that matches the JobID value entered in the form on _OnsiteTable.
I have this so far but I don't know how to compare the JobID values between tables and insert into the specific row.
CREATE TRIGGER UpdateClosedDate
AFTER INSERT on _OnsiteTable
BEGIN
Declare ClosedDate DATETIME;
SET ClosedDate = CURDATE();
CASE WHEN (ClosedDate) = ?
THEN INSERT INTO `_JobTable`( `JobClosedDate`)
VALUES
( ClosedDate);
END CASE;
END
Any help is greatly appreciated!
Complete query now working, thank you! As below:
CREATE TRIGGER UpdateClosedDate
AFTER INSERT on _OnsiteTable
BEGIN
Declare ClosedDate DATETIME;
SET ClosedDate = CURDATE();
UPDATE `_JobTable` SET `JobClosedDate` = ClosedDate WHERE `JobID` = new.JobID;
END

Answer 1

Since the problem was solved with the given comment I will add it here to reference for others with similar issues:
Since you want to Update a column ("insert a value into a column...") You just need to fix your trigger changing your current case statement to an update command as follow:
UPDATE `_JobTable`
SET `JobClosedDate` = ClosedDate
WHERE `JobID` = NEW.JobID;