If you have more than one domain name you'd like to point to your PromoteMyPlace website, you will need to setup domain forwarding with your domain name provider for all additional domains (secondary domains), leaving the primary domain name as it is.
Instructions differ for each provider so you will need to consult your domain provider's online help.
To do this, simply type into Google "domain name forwarding [enter your domain name provider's name here]" e.g. "domain name forwarding 123 Reg" and a link to instructions should appear. If not, contact your domain provider's support team to ask for assistance.
Please note: You want to set up a standard redirect rather than a frame redirect. You may not have the option of the latter, but if you do, make sure you select the standard option.
(A standard redirect means that the URL in the browser is changed to the destination URL. A frame redirect does not change the URL in the browser. Your domain name remains in the browser's address bar and the contents of the destination URL is shown in a frame. Frame redirects are bad for SEO and user experience.)