To edit Player Tendencies:
Load a season (Browse->[select season]->Load)
Select Export JSON->Per-team files (then choose the folder to export the teams)
Click the hamburger icon ☰->Import JSON
Click on the Player Overrides tab and you should see your roster. Make the changes you want, then click 'Save Changes'.
Click 'Write to DAT' and follow the prompts.
Open the Diamond Mind game and open the season you just modified. You should see the changes.
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Change Player Tendencies
Change Manager Tendencies
Set or Change Lineup
Set or Change Pitching Assignments
Export Manager Profiles as HTML