did you activate widget ?
ACP > Extension > Widget
Select in right scroll menu the module recent cards.
Lavender v0.0.22-16 contains updates that'll work with subfolder installs as well
A simple theme for NodeBB. Check out the theming guide that accompanies this work - removing defunct pluginCSS in lavender header, and updating for subfo… · NodeBB/nodebb-theme-lavender@b2c92d6
GitHub (github.com)