To do this, click on "Add-Ons" in the "Extra" menu and then on "Find Add-Ons". On the right side you enter "NoScript" as search term. After the installation you have to restart the browser.
Click on "Settings" in the menu. You can find the "Settings" menu at the top of the window or to the right of the browser line by clicking on the three lines.
The settings will open in a new tab with a link "Show advanced settings" at the bottom of the page. Click on this link and further options will be displayed below.
Under "Privacy" there is a button "Content settings...".