Every ad on the board shows the pay, but not always in the same way (sample).
An hourly rate is what you earn for each hour worked, before tax. A yearly figure is for a full-time week; “pro rata” means you get the share for the hours you do, so a $31,000 job at three days a week pays about $18,600.
If an ad gives a range, the bottom of it is usually where new starters begin. Ask what moves you up the range: it is a fair question, and the job desk can help you word it.