QA and spellcheck
Run QA by going to the QA tab clicking Run all checks or with F9. The full QA includes spell check, but you can also run the spellchecker separately with F7.
You can click the triangle next to the button to select and unselect individual error categories. This may be useful if you for example want to do a narrow search for a specific error type. However, make sure you run a full QA at the end of the project, and follow any other project-specific instructions concerning the QA check.