You can switch to dark mode easily in your account settings by clicking on your profile image on the top right of your screen, then tap settings, and turn on the toggle for dark mode:
To change your text color and theme, go to https://legiit.com/messaging/conversations
and click the settings dial: (pictured below)
For help or questions, please contact help@legiit.com or open a support ticket at this link here: https://legiit.freshdesk.com/support/tickets/new
Thank you for using Legiit to get more stuff done!