How to use/install sodium-plus (sodium-native ? libsodium ?)

I have an issue, I don’t understand how to “install” sodium-plus for using on my website (which scripts from a CDN which code). I don’t understand “sodium-plus”, “sodium-native”, “libsodium”, “libsodium-wrappers”, …

I have a lot of errors (requirejs, I installed it but then “module” is not defined, …).

Help aahahah thank you 🙂