Hi there,
Do you have a cpanel or WHM tool, something like that? I'd be happy to help you with this, by going through the procedure myself first, documenting each step and then walking you through it for the second domain.
I have experience with HTML/CSS/Javascript/PHP/MySQL having worked for 11 years with a yacht charter company as their sole in-house developer up until May of this year when I started on Freelancer. For the yacht company I was asked to build every kind of tool imaginable, sales tools, finance reports, accounts tools, management reports, customer website with search tools, search results, automated PDF creation, real-time chat, etc, etc.
Please send me a message if you like my proposal, even if I am offline. I will reply to any messages ASAP, and tend to be online from around midnight GMT up until 6pm GMT (I am based in Manila).