You're looking for a way to download subtitles for Narcos Season 1. Having subtitles can be super helpful, especially if you're watching a show in a language that's not your native tongue or if you're watching in a noisy environment and need to follow along more closely.
Final checklist before you watch:
Downloading one episode at a time is tedious. Instead: download narcos season 1 subtitles full
Go to Subtitles > Add Subtitle File... and select your downloaded .srt file. You're looking for a way to download subtitles