You need to login to the Zoom channel before you are able to host or join a meeting.
Instructions to login to Zoom channel can be found here:
Once logged into the Zoom channel you need to click ‘Join Meeting’
Copy your zoom link from your Zoom client.
Once you’ve copied zoom link from the client, click ‘Paste Invite Link’.
Once the link is pasted click ‘Join Meeting’.
Meeting has been joined. Please use this article to bring in a Zoom caller as a source.