How do I change the order of Access Levels

trying to get membership to do what I want it to...
New members get an initial access level - but not the one I want them to get.
How can I change this??? I don't see any option to change the order.
Initial subscription is set as desired.

Oh one more question:
in "my subscriptions" there is an overview over all subscriptions BUT there is NO button shown. No offering to change anything.
What can this be?

Thank you!