click on the three dark lines under the word fork.  
then click on scripts.

then click on the green plus sign at the top
of page.

then delete everything in the script.

aiml scripts need <aiml> on the top.

aiml scripts need </aiml> on the bottom.
in the beween those you need <category> at the top and </category> on the side.

in between the category you need <pattern>
at the top.And <pattern> at the side.

in between the pattern you put your keywords
for your sentence.keywords means a selection of words to trigger the response.

underneath the <pattern></pattern> put the
<template></template>.
put in between that the response you want.