how to input custom URL

I think I might be an idiot, but I can't for the life of me find out how to input a custom URL in the New Connection form. The connection type doesn't matter, but just for the sake of completeness, I have my own Cassandra driver type.

Needless to say, that won't work (Illegal character) and I can't input the keyspace manually.
But what I really want to do is just manually input the URL.
Thanks!
Needless to say, that won't work (Illegal character) and I can't input the keyspace manually.
But what I really want to do is just manually input the URL.
Thanks!