If you want to use the SharePoint Sandbox solution to install the Web Part(s) on your website, then you are in the right place. 😉
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Open the settings menu (âš™) and click on Site settings;
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Under Web Designer Galleries, click on Solutions;
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On the tool bar click Upload Solution and select the installation .wsp file (eg. BTXXX_x.x.x.x.wsp);
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As soon as the upload is complete, click on Activate and wait for the page to refresh.
Web Part installed! ✅
Done! To complete the setup process the only thing left to do now is add it to the page and configure all its properties.