[TYPO3-rte] can't add new anchor class

[Thorsten Indra]

Hello,

I need the RTE browser to show me an additional class ("websnapr") for 
external links in the browser.

That should be easy enough  I thought, but after hours of reading the manual 
and forums I am still not successful (T3 newbie, non-programmer ...).

I have tried adding an anchor class in the page config TS of the Home page, 
but must be doing something wrong.
I have also tried enabling the accessibility feature, but that did not seem 
to make a difference either.

Can someone please tell me how and where to add the class "websnapr" to an 
external link?
(I am using rtehtmlarea 1.8.6 and Typo 4.3)

Thanks in advance!
-- 
Best Regards,
Thorsten Indra