Hello Rae,
In order to get to the created position page select the gear icon on the top right of the screen and choose app settings from the drop down. Then choose positions on the next page. This will take you to a screen that will show all of the positions that have been created as well as what colors are assigned to them. You can also add delete or edit positions.
To change the color select any position and you will be able to change the color and edit the name,
To delete a position select the red trash can icon on the right hand side.
To add a new position select the green add button and fill in the position name and choose a color.