Hi Sarah,
Right click should work... from ieSpell website:
If you are using Internet Explorer, you can access ieSpell in one of the following three ways:
Under the "Tools" menu, click on "ieSpell" item to start the spelling check or click on the "ieSpell Options" to configure ieSpell.
Click on the ieSpell toolbar button (if enabled) to activate the spelling check.
Right click in the browser and in the menu that appears, click on the "ieSpell" item to start the spelling check or click on the "ieSpell Options" to configure ieSpell.
If you are using a browser based on the IE engine (e.g. AOL, MSN, NetCaptor, NeoPlanet, etc), then only the last option (i.e. using the right-click menu) is available to you.