If you'd like to direct your participants to a particular webpage, adding a "Hyperlink" to a Zeetings slide is the way to do it.
Here are a few simple steps:
Go to the "Add Content" screen and select "Create a slide"
Type the text you'd like participants to click, such as "Click here"
Highlight that text and then select the link icon (🔗 )
You'll then be presented with a field to insert your link.
When this slide is viewed by participants, they're able to click the link you've create. Links will open for participants in a new tab.
Here's some more information about creating slides.