When using the hootsuite planner feature the fastest way to compose a new message is to:

Answer

First close and exit from the
Planner and then go to the ‘Composer’. Composer shall be located on
the top right corner. After going there, a new stream is to be
created. Thereafter one shall be able to notice a ‘+’ sign. This is
to be clicked and then, the command ‘N’ is to be pressed in order
to have a new message box. Typing could be begun. Finally, the Time
slot option is to be chosen and after that, new post/new pin is to
be selected.