You can change this from your browser menus. Detailed instructions for the more common browsers are given below. If your browser is not mentioned, you will need to explore its menus yourself (but rest assured that you can do it - all brands of browser can interpret Javascript). (Some browsers refer to Javascript as "JScript" and others refer to it as "ECMAScript".)
Enabling Javascript will not impair the security of your system. See the bottom of this page for security information.
This page used to have detailed instructions for disabling Javascript, but it was too much work to keep it up-to-date for all the new versions of several browsers. These links are likely to have up-to-date instructions. If they don't help, just search for "enable javascript" and the name of your browser:
Javascript is not the same as Java. This web site does not require Java. If you have disabled Java for security or privacy reasons, you can leave it disabled.