When you clicked "Enable", what IP address did you specify for the router?
Try typing that into your browser.
Failing which, you will need to find some way of resetting the router back to its factory settings.
BTW, the "Access Point" option is to turn the Router into an Access box only, but as part of another network.
It does bypass the Router's Firewall and security settings as the network it is to be placed in would already have its own security setup.
It has nothing to do with any of your problems.
I would strongly advise you to read up on what networking principles, how Routers, Access Points work and why they are necessary.
Hope that has helped just a little.