Pick a minute and hour mode (every, every N, or exact) and set day, month and weekday fields. The cron expression and a plain-English summary update as you choose.
Set the minute mode to 'Every N minutes' and enter the interval — the tool produces the */N step syntax for you.
Leave day-of-month, month and day-of-week as * (asterisk). An asterisk matches every valid value for that field.
Yes — set day-of-week to a number where 0 is Sunday through 6 is Saturday, e.g. 1 for Monday.