If the button above does not open anything then that most likely means ‘Quick Assist’ is not installed on your computer. To install it ‘click here’. Once the web page loads click the blue ‘Get in Store app’ button. This should load the Microsoft Store on your computer. You can install ‘Quick Assist’ from there.
Alternatively you can open the ‘Microsoft Store’ app on your Windows computer and search for it from there.
Please note, this method of remote assistance will only work on a computer with Windows 10 or above installed.