Not that complicated:
I made a set myself based on the main jersey colors:
https://forums.ootpdevelopments.com/...d.php?t=325297
Follow the instructions given:
The files need to be added on a team-by-team basis, and go in \graphics\rink_pics and use the usual naming format, i.e. the game will look for files in this format: player_chicago_blackhawks_home.png, then player_chicago_blackhawks_home_1989-2012.png, then player_chicago_blackhawks_home_2014.png (i.e., as the logos work; same thing for away teams.) The file should be a 60x60 png - however, you should only use the innermost 36x36 (i.e., everything except the outside 12 rows on all sides) for your design and leave the remaining outside squares transparent, otherwise the icons will look overly-large and may overlap the player's uniform number.