Brought a new theme, but old theme still showing mixed with new theme

It will leave all of the old pages and blocks from hello chic there, but they will take on the basic settings of iris like fonts, colors, ect.  The only two options are to import the demo content for Iris, which will set the site up just like the demo.  Your content will still be there, but in the background if that makes sense.  So the demo pages will be in the nav and need to be switched out with your pages if you want to keep the Chic pages.  You will also have to delete what demo content you do not want.  The other option would be to go through your current pages and change out what blocks you want with the iris blocks.  Or to just replace it with the whole demo page from the block library, then adding back in your wording and images.  Please let me know if you need any help installing it.