Open a blank worksheet in Google Sheets.  Click Add-ons –Get Add-ons.

Add-ons Menu

In the Store search field, enter "Frontline Systems" and press Enter.  Then select the desired add-on by clicking the blue "Free" button next to the add-on. 

Add-ons Store

Depending on the add-on selected, you will be asked to grant permission.

    Request for Permission

Once permission is granted, click Add-ons - <Desired_Add-On> - Start to insert the add-on into the Google Online workbook. 

Click Add-ons – Solver – Start to open the Solver Add-on in a blank Google Workbook. 

Solver Add-on

Click Add-ons – Risk Solver – Start to open the Risk Solver Add-on in a blank Google Workbook. 

Risk Solver Add-on

Click Add-ons – XLMiner Analysis Toolpak - Start to open the XLMiner Analysis ToolPak  add-on in a blank Google Workbook. 

XLMiner Analysis Toolpak

Once an add-on is inserted, you can find it under Add-ons.  

Add-ons Menu