Basic questions about PM Pro

Hi,
I am a newby to WP by I am an experienced software developer. I have justed installed PM Pro into a new WP Social Football Club site I am setting up.

What I need is a plugin so that users can log into the site to see certain pages reserved for members only (ie. Functions etc). They charge a fee for membership so I need Paypal. I also want the rest of the site to be viewable to anyone without logging in. I thought PM Pro might work for this, however after playing with it, I am not sure now as I am having some issues.

Issues:
In a menu, I have placed a link to the “Membership Account” page. A user can then select the required membership (I have only set up a test ‘free’ level). The user selects the required membership level and enters their details but it just takes them back to the original Membership Account page which I think is wrong. Also, how does a user log in once they are already members ? Also, when there is a page that has a membership level set, I get a WP message that says to add comments, you need to log in. When you click this, i get the WordPress login page, can this be changed to something nicer ?

Ideally what I want is a register button and a Username and Password textbox on the main page. can this be done or do I have it all wrong ??

thanks
Dave

https://www.ads-software.com/extend/plugins/paid-memberships-pro/