Subscription added but not viewable

This is actually not for Membership Lite as I have installed Membership 3101 since my last post and ran the wizard and have been running through the set up (so not sure why it's not appearing as an installed plugin). However re: Making A Subscription Plan. I have followed the instructions on page 58 here: https://premium.wpmudev.org/wp-content/uploads/2010/05/Membership-Docs-3101.pdf

Have added a new subscription plan for Level One (I thought I'd done so using the set up wizard but none are appearing)... but when I click 'Add' it returns to the Subscription Plan page and in a yellow box says 'Subscription Added' in a yellow box but is not viewable i.e. is just not appearing. I've added three levels and Levels Access all fine, but subscription plans just aren't working Please advise?

Many thanks
Cheryl