Note: Our Samsung Galaxy tablets have a different procedure to follow, found here.
1) Open an email containing your signature using your smartphone.
2) Press and hold on a word in your email signature, then move the circles to select the entire signature. Tap "Copy".
3) Go back to your inbox. Tap the three lines
icon.
4) Tap on your Rexel email address. Make sure the toggle for signatures is turned on 
. Tap the toggle button if it's not already on. Tap "Signature".
5) Delete the existing signature. Press and hold on empty space in the signature field, then tap "Paste". Tap "Done" in the top right corner.