I'm new to DNN (2 weeks) and aplogize is this is too basic - I've searched but haven't really found what I'm looking for. 

We need to replicate the skin of our main site on another site we have created.  What is the best way to accomplish this?  I don't know if we have the skin in a single file or not - it was developed by a vendor who hadn't done DNN before so I'm not assuming that best practices were followed. 

Thanks in advance -

Bob

 Well, I tried that - did both ways and it still wouldn't change for me.  So, I went into the page settings, selected the page skin and container to match the existing site, hit update and bam - error:

An error has occurred.
DotNetNuke.Services.Exceptions.PageLoadException: The Controls collection cannot be modified because the control contains code blocks (i.e. ). ---> System.Web.HttpException: The Controls collection cannot be modified because the control contains code blocks (i.e. ). at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.UI.Skins.Skin.ProcessMasterModules() at DotNetNuke.UI.Skins.Skin.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Control.AddedControl(Control control, Int32 index) at System.Web.UI.ControlCollection.Add(Control child) at DotNetNuke.Framework.DefaultPage.Page_Init(Object sender, EventArgs e) at System.Web.UI.Control.OnInit(EventArgs e) at System.Web.UI.Page.OnInit(EventArgs e) at DotNetNuke.Framework.PageBase.OnInit(EventArgs e) at System.Web.UI.Control.InitRecursive(Control namingContainer) at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) --- End of inner exception stack trace ---

Now the whole site is hosed with this error.

Any idea of what I should do before I re-install?

 I was able to restore after all that - tried admin.aspx and got back in.  So the question is, what am I doing wrong that I can't get this new skin to show?