Change the 'your bot token here' on line 4 in index.js to your bot applications token, Change the 'your channel id' on line 47 in index.js to the channel id you want the announcement to be sent in
go to https://nodejs.org/en/ download it, run the installer, then do the step following this.
cd 'your unpacked zip file downloaded from here's directory', npm init, npm install eris express body-parser
invite your bot to your server then in the command prompt run node index.js