IntelliJ IDE error, java: package javax.servlet does not exist

As the title says, I'm getting an error when trying to run a basic application in IntelliJ

I know from reading results in Google that the servlet jar seems to be missing, but I have no idea how to add this. The jar file is present in the TomCat installation, but not being recognised by IntelliJ.

Can someone help? This is my first adventure into using Java to build web applications, so I'm a little in-experienced sadly.
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- on eclipse : click right on the project then choose properties. On the  Java Build Path/Libraries tab you clic on the  bouton Add external jar or add jar. And here you go serch the jar servlet-api.jar.You can also click on the bouton Add library and select server runtime hen Tomcat (if you use Tomcat)

- An other possibility if you don't have tools mentioned above and if you are on windows : click right on the workstation Then properties . Advanced tab, click on variable of environment . Add a   variable of environmentmet called CLASSPATH and puts the way which leads in servlet-api.jar. Same Approach  on unix-linux but we need to creat the variable in the hand and the exporter.
SheppardDigitalAuthor Commented:
I'm using IntelliJ and not eclipse.

I do however have eclipse setup and working fine, it's just IntelliJ I can't get work.

I'm using a Mac.
I don't use it either but:

Select the jar that's in Tomcat - you might as well if you're going to stick with that server

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