First, get the app from Apple or Android stores with your mobile. Alternatively, you can also log in to https://www.inshallah.com from your mobile or computer browser.
Click on "Sign Up", you will be asked for an e-mail address. Insert an e-mail that you can easily consult via your mobile or your browser. An e-mail will then be sent to you containing a confirmation link. Click on the confirmation link and follow the steps. Registration should take no longer than 5 minutes.
Please note that you will need to add a photo, either from your phone or your Facebook account. You will be able to blur it if necessary.