Please go here first to properly configure your LTI settings

From your Canvas Courses navigate to Pages and select "+ Page"

To use the Vocareum Tool select Tools > Apps > Vocareum Editor/HTML
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If you run into an issue connecting the Vocareum tool please consult our documentation here

Find the desired assignment and choose whether to use iframe to embed it to the page or add a direct link that opens in a new tab

The Vocaruem assignment should now be visible in the editor

Select Save & Publish