access or entrance ?

If I want to say
Brainstorming access
Brainstorming entrance

or what ???

Neither of these terms makes obvious sense in isolation. What is the context?

The context is eduactional
you know brainstorming which is a process for developing creative solutions to problems
If i want to say the entrance or the way or the access of brainstorming
which is
or what should I say ??

Is this signage in a building?