There's no live spellchecker which checks spelling as you type.
However, you can use the in-built spell checker in DW via Commands > Check Spelling (Shift+F7)
Spell check a web page
Thanks for the reponse. I must have missed that other spell checker though so thanks for pointing that out!
Although, it would be really nice to have something like Wordpress where you can see your mispellings live with a red underline and where I can right click on it to choose the correct spelling.
it would be really nice to have something like Wordpress where you can see your mispellings live
Use Wordpress then..