This tutorial will allow you to add a guidelines link to footer of your site and have it open in a new lightbox window and also make the privacy policy do the same.
Go to ACP -> Customization -> themes
Click the </> code button on the theme you want to edit, this case been the default.
go to Templates -> Core -> Front -> Global -> Footer
find the code..
Code:
{{if \IPS\Settings::i()->privacy_type != "none"}}
..
{{endif}}
change with..
Code:
{{if \IPS\Settings::i()->privacy_type != "none"}}
<li><a href='{{if \IPS\Settings::i()->privacy_type == "internal"}}{url="app=core&module=system&controller=privacy" seoTemplate="privacy"}{{else}}{setting="privacy_link"}{{endif}}' data-ipsdialog data-ipsdialog-title="{lang="privacy"}">{lang="privacy"}</a></li>
{{endif}}
{{if \IPS\Settings::i()->gl_type != "none"}}
<li><a href='{{if \IPS\Settings::i()->gl_type == "internal"}}{url="app=core&module=system&controller=guidelines" seoTemplate="guidelines"}{{else}}{setting="gl_link"}{{endif}}' data-ipsdialog data-ipsdialog-title="{lang="guidelines"}">{lang="guidelines"}</a></li>
{{endif}}
your privacy policy should now open in a lightbox window and also have a new guidelines link that opens the guidelines in a new lightbox window also.