Adding the web part to a page
Once Virto Tab Navigation is installed, you can add it to a page on a site where it’s activated. Add it to the same page as the web parts you want to group into tabs.
Classic page
Open the page and click Edit. In the web part zone where you want the tabs to appear, click Add a Web Part.
In Categories, select Virto Solutions. In Parts, select Virto Tabs Navigation and click Add.

The web part appears on the page as Virto Tabs. While the page is in edit mode, it shows the message “Exit edit page mode to display Tabs”: the tabs themselves appear only after you leave edit mode.

Click Save to save the page.
Modern page
Open the page and click Edit. Hover over the place where you want the web part, click +, and select Virto Tabs Navigation.
While the page is in edit mode, the web part shows the message “Exit edit page mode to display Tabs”. Click Publish to save the page.
Next step
The web part starts with one tab named Default tab. To add more tabs and place web parts on them, see Configuring tabs.