Hello,
Get Trend Micro from the App Store
-Open the App Store on your iPhone or iPad.
-Search for Trend Micro Mobile Security.
-Depending on whether you have the app installed:
-If this is your first time downloading the app, tap Get and then Install.
-If you have downloaded the app before, you will see a cloud icon with a downward arrow. Tap the cloud icon to download and install the app again.
-Once the installation is complete, tap Open to launch the app.
-Tick the boxes and tap accept and continue.
-Choose "Already Purchase" or look for "Settings", then tap "Set up an account", then sign-in your Trend Micro account.