Hi, this is Jennifer from Bookmark. Bookmark does offer advanced SEO settings. We have some user guides that will explain what the options are and walk you through the process of setting up SEO on your site. Here are the links to those guides, or you can look around in the Help Center to see all the user guides we provide.
What SEO information can I add to my site? - lists the type of SEO options
How to add SEO information to your website - walks through setting it up
Those two guides above are for site-wide SEO. If you want to do advanced SEO on individual pages of your website, check out this guide.
Let me know if you have any questions that are not answered in the help guides.
Thanks for choosing Bookmark!