Step 1: Have a reasonable URL schema such as /blog and /blog/<post>.
Step 2: Update your publication record's "url" to point at your site using something like https://pdsls.dev. For this site the value is https://ebey.dev/blog as seen here.
Step 3: Add the following <link>s to your posts:
<link rel="alternate" href="at://did:plc:[user]/site.standard.document/[post]">
<link rel="site.standard.document" href="at://did:plc:[user]/site.standard.document/[post]">Step 4: Add a .well-known/site.standard.publication containing your publication's DID.