Exporting an HTML5 game
As an alternative to using the Scirra Arcade or if it doesn't work out for some reason you can export your game as a website (similar to exporting a Twine story). Please note: this website can't be run locally on your browser. It has code that must be processed on a server. I can upload your game to my own server to get it live on the web and working.
Menu >> Project >> Export
Construct 3 will create a zipped file for you, with an HTML index file inside, plus a lot of other stuff. Email it to me (erik.brown@asmprograms.org). I'll upload it to my server, and then the game will be playable online.