Membership sign up page

How do you bespoke the membership sign up page? i.e. remove the ‘Have a coupon code?’ section?

And rather than having to click to the membership page and then having to click again on the ‘sign up’ button making it a two stage procedure to even get to the sign-up form, is there a way of making the form show directly?

I’ve tried the AJAX version of the form which shows up immediately, but I’m finding some people who are testing the site can’t get the form to open.

Also, is there are way to force membership sign-ups to be approved by the administrator of the site before the person is granted access to the site?