How to add an optin at an end of a blog post so people can get a PDF etc.

video1.0<iframe src="https://www.loom.com/embed/35a3c5e0435946148b897fb9ce7087be" frameborder="0" width="900" height="675" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>675900Loomhttps://www.loom.com675900https://cdn.loom.com/sessions/thumbnails/35a3c5e0435946148b897fb9ce7087be-00001.gif400How to add an optin at an end of a blog post so people can get a PDF etc.