To use cdispass: Add its location to your load_paths and require it.

load_paths.push("/path/to/cdispass/");
require("cdispass");

And then you can use M-x dispass or you could bind dispass-and-submit to some key, like:

define_key(content_buffer_text_keymap, "C-c d", "dispass-and-submit");

Which would cause C-c d to call the dispass command, insert the result in the current focused element and then submit the form in which the element is placed.