On a tablet, go to the Review tab and tap the Spell Check icon.
On a phone, tap the Edit icon , and then tap Home > Review > Spelling.
On an iPad, go to the Review tab, tap the Spell Check icon , and then turn on Spelling.
On an iPhone, tap the Edit icon , tap Home > Review > Proofing tools, and then turn on Spelling.
On the Review tab, tap the Spell Check icon.