No right side Rules Edit/ Add Membership Levels

Hi,

In trying to edit/ add membership levels I am greeted with a page to drag and drop elements into the areas provided (positive/ negative). The instructions say

"On the Add new page name your level, and drag rules from the right hand side of the page into the Positive or Negative rule areas.

Placing a rule in the positive area gives a user (belonging to that level) access to the content detailed in that rule.
Placing a rule in the negative area removes a users access to the content detailed in that rule."

However there is NO "rules from the right hand side of the page".

Can someone clarify the issue here and offer a solution for it