UTFSE = Use the fucked-up search engine
Luckily I have these bookmarked.
Post 442105
(DRIVEN: "NaOCN from urea and sodium carbonate", Methods Discourse) has most of the links to procedurals for NaOCN, while
Post 354295
(Bandil: "trans-4-MAR synth w/o cyanogenbromide writeup!", Methods Discourse) is the famous 4-MAR thread.
Also, if he uses the google search engine, especially for "homemade cyanide", he should be able to find, as it the NaCN synth makes NaOCN first, then reduces it with charcoal carbon.
Whatever is wrong with the search engine?