Pull ID from one table via combobox to update a different table

I have a form that brings up a record from the employees table and displays general starter information (ie, employee ID, first name, last name) and then once I have filled the rest of the textboxes, comboboxes, etc, I need it to populate a different table ("Driver" table).

The picture attached is the form I'm working on. The fields that are populated from the Employees table are:

• Employee
• First Name
• Last Name
• Employee ID

I'd like the form to take the employee ID number and update the table with the information provided from the textboxes.

Here is my code, so far:

Public Class frmVehDriver

    Private Sub frmVehDriver_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'SecurityDataSet.Driver' table. You can move, or remove it, as needed.
        Me.DriverTableAdapter.Fill(Me.SecurityDataSet.Driver)
        'TODO: This line of code loads data into the 'SecurityDataSet.Employees' table. You can move, or remove it, as needed.
        Me.EmployeesTableAdapter.Fill(Me.SecurityDataSet.Employees)
        'TODO: This line of code loads data into the 'SecurityDataSet.Driver' table. You can move, or remove it, as needed.
        Me.DriverTableAdapter.Fill(Me.SecurityDataSet.Driver)

    End Sub

    Private Sub btnSave_Click(sender As Object, e As EventArgs) Handles btnSave.Click
        Me.Validate()
        Me.DriverBindingSource.EndEdit()
        Me.TableAdapterManager.UpdateAll(Me.SecurityDataSet)
        MsgBox("Saved")
    End Sub

    Private Sub btnExit_Click(sender As Object, e As EventArgs) Handles btnExit.Click
        Me.Close()
    End Sub
End Class