how do I add search engines without adding an addon?

in firefox I can just right click the address bar after doing a search

and click something along the lines of "add search engine"

then it's added to the available list

but here that isn't an option

I forgot how cool mofits are in Chatzilla, rediscovery is great!

superryn isn't here anymore, but for the log: in a page that advertises a search engine the "add..." option should appear in the search bar drop-down (not context menu, but the search engine selection drop-down menu you get by clicking in the current search engine icon)