TLDR: To start, select the 'Share Bank Statements Task' from the list, then press 'Next' to choose accounts for sharing statements.
Starting the Task
To start the task please select the 'Share Bank Statements Task' task from the task list. You'll then be given a brief introduction to the task and what you have to provide.
Providing your Bank Statements
When you are ready to proceed please press the blue 'Next' option, and you'll then be able to select which accounts you want to share a statement for. You can read more on completing this here.