Click on the blue circle with the white question mark in the top right hand corner.
Step 2: Click Options
Step 3: Click Spell Checking and you will have the option to update the following:
Show spelling errors in editor
Suggest from main dictionary only
Ignore words in UPPERCASE
Ignore words with numbers
Ignore internet addresses and emails
Always suggest corrections.
Ignore improper case (e.g. “Australia Table”)
There is also a User Dictionary that will allow you to add words that you use often that could be seen as an incorrect spelling such as a last name.