As Zoom utilizes the same Zendesk Help Center we do it is recommend that you search their support site for any questions or issues you may be having with Zoom. There are many helpful step-by-step instructions, articles and videos. Here is the link: https://support.zoom.us/hc.
Note: If you are experiencing technical issues with Zoom we recommend checking their status page here: https://status.zoom.us/
To share your screen from an iPad follow the steps in this article: https://support.zoom.us/hc/en-us/articles/115005890803
If you cannot locate the answer to your question please submit a ticket to Tech Help @ SMA.