You need to install first the MessagingDapp on your local LISK testnet.
Then, copy your Dapp Id and be sure to update the source files with the correct Dapp Id:
in desktop/index.html and mobile/www/index.html find the line with :
var dappId = "105601020317470892";and update accordingly.
Assuming you have installed NPM.
cd desktop/
npm install && npm start
Assuming you have installed and configured cordova properly.
cd mobile/
cordova add platform android
cordova run
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