I need help with the whiteboard!

I am a tutor. I am getting so frustrated with Zoom I am thinking of cancelling my subscription. I cannot invite my students to collaborate, they can't write, type or annotate on the whiteboard. They can't even see a bar. The videos and the photos on here do not match up to what I have on my MacBook. I can't change the settings. I need someone to get in touch and help. I just paid the extra subscruption as I thought that was the issue but it clearly was not.