Basic setup guide

Hi, having a few issues with the basic setup of the directory theme. Cannot find where i insert or set up login/register buttons, how actually membership payments work i.e.. I manually send invoice or can the system generate this for me. etc is it paypal?
Is there anywhere a basic setup manual please? I have watched videos but find it leaves gaps in my education. Figured how to create logo banner across top of site by inserting into advertisement banner but how do I remove coloured strip across the top? My site is http://www.pilbaratradedirectory.com.au any advice appreciated.
thankyou