Am I able to create table using EM Express Oracle 12c
You can not do that in EM Express.

Oracle Database 12c: EM Database Express

I'm trying to perform a task I used to do in DB Control.  Where is it in EM Express?


  Although EM Express provides support for basic administrative tasks,
  it is not a direct replacement for DB Control.  As explained in the
  Architecture section, EM Express is built inside the database server
  and cannot perform actions outside the database.  Also, EM Express is
  focused primarily on providing performance management and monitoring
  functionality, and is not meant to be an all-around database
  administration tool.