Please help trying to complete project

Error: Cannot find module ‘rxjs’
Require stack:

  • C:\Users\james\Desktop\moralis\main.js
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
    at Function.Module._load (node:internal/modules/cjs/loader:778:27)
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object. (C:\Users\james\Desktop\moralis\main.js:2:19)
    at Module._compile (node:internal/modules/cjs/loader:1097:14)
    at Object.Module._extensions…js (node:internal/modules/cjs/loader:1149:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:77:12) {
    code: ‘MODULE_NOT_FOUND’,
    requireStack: [ ‘C:\Users\james\Desktop\moralis\main.js’ ]
    }

following this tutorial and don’t know what to put for ‘RxJS’ in the second line any clue what to add or change it too?

you may need to install packages first