Withholding more tax due to getting a second job?

I originally worked casual at a supermarket. Have just got a full-time job as an accountant and will be doing weekends still at the original supermarket.

Presuming I should withhold more tax so I don’t get a tax bill? But don’t really know how much etc, any advice? ($74,000 and $19,000 are their respective salaries)

Edit : I’m in Australia