Continue editing website once it's launched

Thank you Skandha I will contact LCN who I have purchased domain and hosting from, I have also set up my mails on my mac already, thanks So I understood correctly; once the website is launched any changes I make to it on the background will not take effect till published? which mean I can make changes and preview without it effecting what the visitors see, until I confirm update/publish. I am using catchfullscreen, through wordpress via lcn, so my question is that once the site is launched do I still have access to the dashboard via my-stie/wordpress or .... how do I carry on amending the site? Thank you atousa