1) What command are you using/trying in your console?
2) Do you actually have gcloud installed (correctly)?
To deploy your app, the minimum command is 'gcloud app deploy' . If you are executing this in your project's root folder, the system will deploy the 'app.yaml' file it finds in the root folder. If it can't find one, it will error out.
See this
link for gcloud app deploy documentation
If you're sure you have gcloud correctly installed, you are using GAE standard environment and you're still having problems (or you prefer not to deal with command-line/terminal) , we have a GUI -
https://nocommandline.com - that allows you to just select your project and click a button to run, deploy and execute other functions.