When using the Hootsuite Planner feature, the fastest way to compose a new message is to:

Clicking on a time slot in the Hootsuite Planner and selecting "New Post" or "New Pin" is the most efficient method because it directly opens the Composer pre-populated with the selected date and time. This streamlines the scheduling process by eliminating extra steps. Pressing "command N" is a common keyboard shortcut for "new" in many applications, but it's not a function within the Hootsuite Planner for creating a new message. Creating a new stream is for monitoring content, not for composing new messages. Exiting the Planner to open the Composer from the top right corner adds unnecessary steps, making it a less efficient option compared to using the Planner's integrated functionality.