How do I change account colours in Email app and task colours in S Planner?

[Buzz B]

Hello community,

I would like to change the colour associated with the email accounts (three Microsoft Exchange Active Sync accounts) that are displayed in the Galaxy S6 Email app so that it can match the colour set in the S Planner app (or vice versa). Also, although I can change the calendar colour I can't change the task colour, which is frustrating because I need to associate the tasks to their counterpart accounts.

I appreciate any help and advice offered.

Buzz