There is no English input method included in the fcitx pet. Therefore if you want to input English after fcitx is running, you have to disable fcitx.
you can do this in 2 ways:
A. exit on fcitx window:
1. open an application that allows user input, e.g. geany or Abiword
2. ctrl+space - the fcitx input method window will appear
3. mouse right click on the fcitx window - a drop down menu will appear
4. mouse left click on bottom last item in the drop-down window "Exit"
B. using terminal
1. in terminal, type "killall fcitx", enter
After doing A or B, you will disable fcitx and all user input will be in English
To input Chinese again, open terminal, type fcitx to restart it
I will try to include English as one available input method for fcitx in the future.
icake